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LTC5532 Precision 300MHz to 7GHz RF Detector with Gain and Offset Adjustment
FEATURES
s s s s s s s s s
DESCRIPTIO
Temperature Compensated Internal Schottky Diode RF Detector Wide Input Frequency Range: 300MHz to 7GHz* Wide Input Power Range: -32dBm to 10dBm Buffered Detector Output with External Gain Control Precision VOUT Offset Control Low Starting Voltage: 120mV 35mV for Gain = 2x Wide VCC Range of 2.7V to 6V Low Operating Current: 500A Available in a Low Profile (1mm) SOT-23 Package and Tiny 6-Lead (2mm x 2mm) DFN Package
The LTC(R)5532 is an RF power detector for RF applications operating in the 300MHz to 7GHz range. A temperature compensated Schottky diode peak detector and buffer amplifier are combined in a small ThinSOTTM or (2mm x 2mm) DFN package. The supply voltage range is optimized for operation from a single lithium-ion cell or 3x NiMH. The RF input voltage is peak detected using an on-chip Schottky diode. The detected voltage is buffered and supplied to the VOUT pin. The LTC5532 output buffer gain is set via external resistors. The initial starting voltage of 120mV 35mV can be precisely adjusted using the VOS pin. The LTC5532 operates with RF input power levels from -32dBm to 10dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. *Higher frequency operation is achievable with reduced performance. Consult factory for more information.
APPLICATIO S
s s s s s s s
802.11a, 802.11b, 802.11g, 802.15 Multimode Mobile Phone Products Optical Data Links Wireless Data Modems Wireless and Cable Infrastructure RF Power Alarm Envelope Detector
TYPICAL APPLICATIO
Output Voltage vs RF Input Power (SOT-23 Package) 300MHz to 7GHz RF Power Detector (SOT-23 Package)
33pF RF INPUT 1 RFIN VCC 6 100pF 5 RA VOS VM 4 RB
5532 TA01
3600
VOUT OUTPUT VOLTAGE (mV)
VCC = 3.6V 3200 TA = 25C GAIN = 2 2800 VOS = 0V 2400 2000 1600 1200 800 400 2000MHz 3000MHz
VCC 0.1F
LTC5532ES6 2 GND VOUT
VOS REFERENCE
3
0 -32 -27 -22 -17 -12 -7 -2 RF INPUT POWER (dBm)
U
1000MHz 300MHz 4000MHz 5000MHz 6000MHz 7000MHz 3 8
5532 TA02
U
U
5532f
1
LTC5532
ABSOLUTE
AXI U RATI GS (Note 1)
Maximum Junction Temperature ......................... 125C Storage Temperature Range ................ - 65C to 125C Lead Temperature (Soldering, 10 sec) SOT-23 Only ......................................................... 300C
VCC, VOUT, VM, VOS .................................. -0.3V to 6.5V RFIN Voltage ......................................(VCC 1.5V) to 7V RFIN Power (RMS) ............................................. 12dBm IVOUT ...................................................................... 5mA Operating Temperature Range (Note 2) .. - 40C to 85C
PACKAGE/ORDER I FOR ATIO
TOP VIEW VCC 1 VOUT 2 VM 3 7 6 RFIN 5 GND 4 VOS
ORDER PART NUMBER LTC5532EDC DC6 PART MARKING LAFR
RFIN 1 GND 2 VOS 3
DC6 PACKAGE 6-LEAD (2mm x 2mm) PLASTIC DFN TJMAX = 125C, JA = 85C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 3.6V, RF Input Signal is Off, RA = RB = 1k, VOS = 0V unless otherwise noted (Note 2).
PARAMETER VCC Operating Voltage IVCC Operating Current VOUT VOL (No RF Input) VOUT Output Current VOUT Bandwidth VOUT Load Capacitance VOUT Slew Rate VOUT Noise VOS Voltage Range VOS Input Current VM Voltage Range VM Input Current RFIN Input Frequency Range RFIN Input Power Range RFIN AC Input Resistance RFIN Input Shunt Capacitance CONDITIONS
q
ELECTRICAL CHARACTERISTICS
IVOUT = 0mA RLOAD = 2k, VOS = 0V VOUT = 1.75V, VCC = 2.7V, VOUT < 10mV CLOAD = 33pF, RLOAD = 2k (Note 4) (Note 6) VRFIN = 1V Step, CLOAD = 33pF, Total RLOAD = 2k (Note 3) VCC = 3V, Noise BW = 1.5MHz, 50 RF Input Termination, 50 AC Output Termination VOS = 1V
VM = 3.6V q (Note 7) RF Frequency = 300MHz to 7GHz (Note 5, 6) VCC = 2.7V to 6V F = 1000MHz, Pin = -25dBm F = 1000MHz, Pin = -25dBm
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: The rise time at VOUT is measured between 1.3V and 2.3V.
2
U
U
W
WW U
W
TOP VIEW 6 VCC 5 VOUT 4 VM
ORDER PART NUMBER LTC5532ES6 S6 PART MARKING LTAFS
S6 PACKAGE 6-LEAD PLASTIC TSOT-23
TJMAX = 125C, JA = 250C/W
MIN 2.7 85 2
TYP 0.5 100 to 140 4 2 3 1
q q q q
MAX 6 0.7 155
33
UNITS V mA mV mA MHz pF V/s mVP-P V A V A MHz dBm pF
q q q
0 -0.5 0 -0.5 300 to 7000 -32 to 10 220 0.65
1 0.5 VCC -1. 8 0.5
Note 4: Bandwidth is calculated based on the 10% to 90% rise time equation: BW = 0.35/rise time. Note 5: RF performance is tested at 1800MHz Note 6: Guaranteed by design. Note 7: Higher frequency operation is achievable with reduced performance. Consult factory for more information.
5532f
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
unless otherwise indicated. Output Voltage vs Supply Voltage (RF Input Signal Off)
130 VOS = 0V GAIN = 2 500
VOUT OUTPUT VOLTAGE (mV)
SUPPLY CURRENT (A)
125
TA = 85C TA = 25C
OUTPUT DELAY (ns)
120 TA = -40C 115
110 2.5
3.0
3.5
5.0 SUPPLY VOLTAGE (V)
4.0
4.5
Typical Detector Characteristics, 300MHz, Gain = 2, VOS = 0V
3600 3200 VOUT OUTPUT VOLTAGE (mV) VOUT OUTPUT VOLTAGE (mV) 2800 2400 2000 1600 1200 800 400 TA = 85C TA = 25C TA = -40C VCC = 3.6V 3600 3200 2800 2400 2000 1600 1200 800 400 4 8
VOUT OUTPUT VOLTAGE (mV)
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
Typical Detector Characteristics, 3000MHz, Gain = 2, VOS = 0V
3600 3200 VOUT OUTPUT VOLTAGE (mV) VOUT OUTPUT VOLTAGE (mV) 2800 2400 2000 1600 1200 800 400 TA = 85C TA = 25C TA = -40C VCC = 3.6V 3600 3200 2800 2400 2000 1600 1200 800 400 8
VOUT OUTPUT VOLTAGE (mV)
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
UW
5.5
5532 G01 5532 G04
(RLOAD = 20k) Characteristics are for both packages
Supply Current vs Supply Voltage (RF Input Signal Off)
1000
Output Delay vs RF Input Power
VCC = 3.6V TA = 25C VOS = 0V GAIN = 2
480
800
TA = -40C
600
460
TA = 25C TA = 85C
400
90% SWITCHING
440
200
50% SWITCHING
6.0
420 2.5
3.0
3.5
5.0 SUPPLY VOLTAGE (V)
4.0
4.5
5.5
6.0
0
-10
0 -5 5 RF INPUT POWER (dBm)
10
5532 G03
5532 G02
Typical Detector Characteristics, 1000MHz, Gain = 2, VOS = 0V
VCC = 3.6V TA = -40C 3600 3200 2800 2400 2000 1600 1200 800 400 4 8
Typical Detector Characteristics, 2000MHz, Gain = 2, VOS = 0V
VCC = 3.6V
TA = -40C
TA = 25C
TA = 25C
TA = 85C
TA = 85C
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
8
5532 G05
5532 G06
Typical Detector Characteristics, 4000MHz, Gain = 2, VOS = 0V
VCC = 3.6V 3600 3200 2800 2400 2000 1600 1200 800 400 4 8 TA = -40C
Typical Detector Characteristics, 5000MHz, Gain = 2, VOS = 0V (SOT-23 Package)
VCC = 3.6V
TA = -40C
TA = 25C
TA = 25C
TA = 85C
TA = 85C
4
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
8
5532 G07
5532 G08
5532 G09
5532f
3
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
unless otherwise indicated. Typical Detector Characteristics, 6000MHz, Gain = 2, VOS = 0V (SOT-23 Package)
3600 3200 VOUT OUTPUT VOLTAGE (mV) VOUT OUTPUT VOLTAGE (mV) 2800 2400 2000 1600 1200 800 400 TA = 85C TA = 25C TA = -40C VCC = 3.6V 3600 3200 2800 2400 2000 1600 1200 800 400 8 TA = 85C 0 -32 -27 -22 -17 -12 -7 -2 3 RF INPUT POWER (dBm) TA = -40C TA = 25C VOUT OUTPUT VOLTAGE (mV)
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
Typical Detector Characteristics, 1000MHz, Gain = 4, VOS = 0V
3600 3200 VOUT OUTPUT VOLTAGE (mV) 2800 2400 2000 1600 1200 800 400 TA = 85C TA = 25C VOUT OUTPUT VOLTAGE (mV) TA = -40C VCC = 3.6V 3600
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
VOUT vs RF Input Power and VOS, 1000MHz, Gain = 2
3600 VCC = 3.6V 3200 TA = 25C
VOUT OUTPUT VOLTAGE (mV)
VOUT OUTPUT VOLTAGE (mV)
2800 2400 2000 1600 1200 800 400 VOS = 1V VOS = 0.5V
VOS = 0.2V VOS = 0V 0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
UW
4
(RLOAD = 20k) Characteristics are for both packages
Typical Detector Characteristics, 7000MHz, Gain = 2, VOS = 0V (SOT-23 Package)
VCC = 3.6V 3600 3200
Typical Detector Characteristics, 300MHz, Gain = 4, VOS = 0V
VCC = 3.6V TA = -40C 2800 2400 2000 1600 1200 800 400 8 0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm) 4 8 TA = 25C TA = 85C
5532 G07
5532 G11
5532 G12
VOUT vs RF Input Power and VOS, 300MHz, Gain = 2
VCC = 3.6V 3200 TA = 25C 2800 2400 2000 1600 1200 800 400 VOS = 1V VOS = 0.5V
4
8
VOS = 0.2V VOS = 0V 0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
8
5532 G13
5532 G14
VOUT vs RF Input Power, 300MHz and 1000MHz, Gain = 2 and 4, VOS = 0V
3600 VCC = 3.6V 3200 TA = 25C 2800 2400 2000 1600 1200 800 400 300MHz GAIN = 2 300MHz GAIN = 4 1000MHz GAIN = 4
4
8
1000MHz GAIN = 2 0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
5532 G16
8
5532 G15
5532f
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
unless otherwise indicated. VOUT Slope vs RF Input Power at 300MHz
1000 VCC = 3.6V GAIN = 2 VOS = 0V 1000
VOUT SLOPE (mV/dB)
VOUT SLOPE (mV/dB)
100
100
VOUT SLOPE (mV/dB)
TA = -40C 10 TA = 85C
TA = 25C 1 -30 -25 -20 -15 -10 -5 RF INPUT POWER (dBm) 0 5
5532 G17
VOUT Slope vs RF Input Power at 3000MHz
1000 VCC = 3.6V GAIN = 2 VOS = 0V 1000
VOUT SLOPE (mV/dB)
VOUT SLOPE (mV/dB)
100
100
VOUT SLOPE (mV/dB)
TA = -40C 10 TA = 85C
TA = 25C 1 -30 -25 -20 -15 -10 -5 RF INPUT POWER (dBm) 0 5
5532 G20
VOUT Slope vs RF Input Power at 6000MHz (SOT-23 Package)
1000 VCC = 3.6V GAIN = 2 VOS = 0V
1000
VOUT SLOPE (mV/dB)
VOUT SLOPE (mV/dB)
100
TA = -40C 10 TA = 85C
1 -30
-25
-20 -15 -10 -5 RF INPUT POWER (dBm)
UW
(RLOAD = 20k) Characteristics are for both packages VOUT Slope vs RF Input Power at 2000MHz
1000 VCC = 3.6V GAIN = 2 VOS = 0V
VOUT Slope vs RF Input Power at 1000MHz
VCC = 3.6V GAIN = 2 VOS = 0V
100
TA = -40C 10 TA = 85C
TA = -40C 10 TA = 85C
TA = 25C 1 -30 -25 -20 -15 -10 -5 RF INPUT POWER (dBm) 0 5
5532 G18
TA = 25C 1 -30 -25 -20 -15 -10 -5 RF INPUT POWER (dBm) 0 5
5532 G19
VOUT Slope vs RF Input Power at 4000MHz
VCC = 3.6V GAIN = 2 VOS = 0V 1000
VOUT Slope vs RF Input Power at 5000MHz (SOT-23 Package)
VCC = 3.6V GAIN = 2 VOS = 0V
100
TA = -40C 10 TA = 85C
TA = -40C 10 TA = 85C
TA = 25C 1 -30 -25 -20 -15 -10 -5 RF INPUT POWER (dBm) 0 5
5532 G21
TA = 25C 1 -30 -25 -20 -15 -10 -5 RF INPUT POWER (dBm) 0 5
5532 G22
VOUT Slope vs RF Input Power at 7000MHz (SOT-23 Package)
VCC = 3.6V GAIN = 2 VOS = 0V
100
TA = -40C 10 TA = 85C
TA = 25C
1 -30
TA = 25C
0
5
5532 G23
-25
-20 -15 -10 -5 RF INPUT POWER (dBm)
0
5
5532 G22
5532f
5
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
Typical Detector Characteristics 5000MHz, Gain = 2, VOS = 0V (DFN Package)
3600 3200 VCC = 3.6V VOUT OUTPUT VOLTAGE (mV) 3600 3200 2800 2400 2000 1600 1200 800 400 8 TA = 85C TA = -40C TA = 25C VOUT OUTPUT VOLTAGE (mV)
VOUT OUTPUT VOLTAGE (mV)
2800 2400 2000 1600 TA = 25C 1200 800 400 TA = 85C TA = -40C
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
Output Voltage vs RF Input Power (DFN Package)
3600 3200 300MHz 1GHz 2GHz 4GHz 5GHz 6GHz 7GHz VCC = 3.6V TA = 25C GAIN = 2 VOS = 0V
1000
VOUT OUTPUT VOLTAGE (mV)
2800
2400 2000
VOUT SLOPE (mV/dB)
1600 1200 800 400
0 -32 -27 -22 -17 -12 -7 -2 RF INPUT POWER (dBm)
VOUT Slope vs RF Input Power at 6000MHz (DFN Package)
1000 VCC = 3.6V GAIN = 2 VOS = 0V 1000
VOUT SLOPE (mV/dB)
100
VOUT SLOPE (mV/dB)
10
TA = -40C
1 -30
-25
-20 -15 -10 -5 RF INPUT POWER (dBm)
6
UW
4
5532 G25
(DFN package, RLOAD = 20k) Typical Detector Characteristics 7000MHz, Gain = 2, VOS = 0V (DFN Package)
3600 3200 2800 2400 2000 1600 1200 800 400 8 TA = 85C TA = -40C TA = 25C VCC = 3.6V
Typical Detector Characteristics 6000MHz, Gain = 2, VOS = 0V (DFN Package)
VCC = 3.6V
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm)
4
8
5532 G26
5532 G27
VOUT Slope vs RF Input Power at 5000MHz (DFN Package)
VCC = 3.6V GAIN = 2 VOS = 0V
100
10
TA = -40C
TA = 85C TA = 25C
3
8
1 -30
-25
-20 -15 -10 -5 RF INPUT POWER (dBm)
0
5
5532 G29
5532 G28
VOUT Slope vs RF Input Power at 7000MHz (DFN Package)
VCC = 3.6V GAIN = 2 VOS = 0V
100
TA = 85C TA = 25C
10
TA = -40C
TA = 85C TA = 25C
0
5
5532 G30
1 -30
-25
-20 -15 -10 -5 RF INPUT POWER (dBm)
0
5
5532 G31
5532f
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
RFIN Input Impedance (Pin = 0dBm, VCC = 3.6V, TA = 25C)
FREQUENCY (GHz) 0.30 0.50 0.70 0.90 1.10 1.30 1.50 1.70 1.90 2.10 2.30 2.50 2.70 2.90 3.10 3.30 3.50 3.70 3.90 4.10 4.30 4.50 4.70 4.90 5.10 5.30 5.50 5.70 5.90 6.10 6.30 6.50 6.70 6.90 7.00 RESISTANCE () 290.45 234.41 178.25 137.31 109.17 86.30 68.65 57.48 49.79 43.56 38.67 34.82 31.68 29.13 27.17 25.73 24.56 23.18 22.31 20.73 19.88 19.40 19.05 19.08 19.55 20.85 21.94 20.60 19.29 18.69 18.53 18.74 19.79 19.75 19.99 REACTANCE () -136.22 -162.54 -170.53 -159.89 -147.57 -136.18 -121.74 -107.60 - 96.72 - 86.70 -77.91 -70.13 - 62.86 - 56.01 - 49.83 - 44.24 - 39.74 - 35.35 - 30.62 -26.88 -22.31 -18.23 -14.25 -10.21 - 6.30 - 2.84 -1.49 - 0.07 2.99 6.61 10.39 14.35 17.91 20.77 22.47
UW
(SOT-23 Package)
S11 Forward Reflection Impedance
0.3000GHz-7.000GHz
5508 TA03
5532f
7
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
RFIN Input Impedance (Pin = -25dBm, VCC = 3.6V, TA = 25C)
FREQUENCY (GHz) 0.30 0.50 0.70 0.90 1.10 1.30 1.50 1.70 1.90 2.10 2.30 2.50 2.70 2.90 3.10 3.30 3.50 3.70 3.90 4.10 4.30 4.50 4.70 4.90 5.10 5.30 5.50 5.70 5.90 6.10 6.30 6.50 6.70 6.90 7.00 RESISTANCE () 216.45 190.63 161.98 133.17 113.08 94.55 75.33 63.52 55.19 48.64 43.73 39.71 36.47 33.69 31.61 29.78 28.27 26.63 26.12 24.20 23.28 22.60 22.21 22.15 22.61 23.90 24.97 23.51 22.25 21.57 21.43 21.69 22.68 22.81 23.07 REACTANCE () -76.47 -98.28 -112.03 -111.53 -109.05 -107.08 - 98.50 - 88.19 - 80.05 -72.23 - 64.81 - 58.31 - 52.27 - 46.77 - 41.25 -36.61 -32.39 -28.12 -23.97 -20.75 -16.69 -12.77 - 9.08 -5.24 -1.58 1.53 2.62 4.00 6.94 10.62 14.02 17.77 21.24 24.21 25.56
8
UW
(SOT-23 Package)
S11 Forward Reflection Impedance
0.3000GHz-7.000GHz
5508 TA04
5532f
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
RFIN Input Impedance (Pin = 0dBm, VCC = 3.6V, TA = 25C)
FREQUENCY (GHz) 0.30 0.50 0.70 0.90 1.10 1.30 1.50 1.70 1.90 2.10 2.30 2.50 2.70 2.90 3.10 3.30 3.50 3.70 3.90 4.10 4.30 4.50 4.70 4.90 5.10 5.30 5.50 5.70 5.90 6.10 6.30 6.50 6.70 6.90 7.00 RESISTANCE () 305.23 238.58 185.32 142.06 111.93 90.59 75.22 63.37 53.84 47.11 41.34 37.00 33.60 30.96 28.55 26.36 24.52 23.12 22.01 21.13 20.44 19.85 19.42 19.03 18.78 18.69 18.80 19.09 19.68 20.05 20.18 20.35 19.84 19.81 19.95 REACTANCE () -144.87 -173.62 -177.82 -167.59 -152.80 -139.47 - 126.45 - 114.14 - 103.83 -94.33 - 85.18 - 76.93 - 69.47 - 62.66 - 56.74 -51.02 -45.95 -40.97 -36.25 -31.82 -27.51 -23.69 - 20.18 -16.54 -12.88 - 9.21 -5.72 -2.32 0.85 3.49 6.37 9.23 12.37 15.97 17.83
UW
(DFN Package)
S11 Forward Reflection Impedance
0.3000GHz-7.000GHz
5508 TA05
5532f
9
LTC5532 TYPICAL PERFOR A CE CHARACTERISTICS
RFIN Input Impedance (Pin = -25dBm, VCC = 3.6V, TA = 25C)
FREQUENCY (GHz) 0.30 0.50 0.70 0.90 1.10 1.31 1.50 1.70 1.90 2.10 2.31 2.51 2.70 2.90 3.10 3.30 3.50 3.70 3.90 4.10 4.30 4.50 4.70 4.90 5.10 5.30 5.50 5.70 5.90 6.10 6.30 6.50 6.70 6.90 7.00 RESISTANCE () 225.19 196.59 166.23 137.24 114.69 96.83 83.12 72.11 61.69 53.76 47.46 42.60 39.04 36.25 33.41 30.78 28.85 27.28 26.08 24.97 24.18 23.43 22.88 22.41 22.09 21.82 21.91 22.08 22.84 23.75 23.32 22.57 22.17 22.20 22.27 REACTANCE () -79.32 -105.44 -114.07 -115.88 -111.94 -106.10 - 99.28 - 92.73 - 85.98 -78.71 - 71.16 - 64.52 - 58.61 - 53.23 - 48.13 -43.37 -38.83 -34.09 -29.73 -25.80 -21.94 -18.27 - 15.04 -11.56 -8.08 - 4.34 -1.29 2.15 5.32 7.51 9.47 12.41 15.79 19.34 21.21
10
UW
(DFN Package)
S11 Forward Reflection Impedance
0.3000GHz-7.000GHz
5508 TA06
5532f
LTC5532
PI FU CTIO S
RFIN (Pin 1/Pin 6): RF Input Voltage. Referenced to VCC. A coupling capacitor must be used to connect to the RF signal source. The frequency range is 300MHz to 7GHz. This pin has an internal 500 termination, an internal Schottky diode detector and a peak detector capacitor. Operation at higher frequencies is achievable, consult factory for more information. GND (Pin 2/Pin 5): Ground. VOS (Pin 3/Pin 4): VOUT Offset Voltage Adjustment. From 0V to 120mV, VOUT does not change. Above 120mV, VOUT will track VOS.
BLOCK DIAGRA
RFSOURCE
RFIN
GND
W
U
U
U
(SOT-23/DFN)
VM (Pin 4/Pin 3): Inverting Input to Buffer Amplifier. VOUT (Pin 5/Pin 2): Detector Output. VCC (Pin 6/Pin 1): Power Supply Voltage, 2.7V to 6V. VCC should be bypassed appropriately with ceramic capacitors. Exposed Pad (NA/Pin 7): Exposed Pad is GND. Must be soldered to PCB.
VCC
+
BUFFER 500
VOUT
-
VM 500 BIAS 31k 25pF 24k
+
RF DET 80k
+ -
120mV
VOS
-
80k
50A
50A
+
5532 BD
5532f
11
LTC5532
APPLICATIO S I FOR ATIO
Operation The LTC5532 RF detector integrates several functions to provide RF power detection over frequencies ranging from 300MHz to 7GHz. These functions include an internal frequency compensated buffer amplifier, an RF Schottky diode peak detector and a level shift amplifier to convert the RF input signal to DC. The LTC5532 has both gain setting and voltage offset adjustment capabilities. Buffer Amplifier The output buffer amplifier is capable of supplying typically 4mA into a load. The negative terminal VM is brought out to a pin for gain selection. External resistors connected between VOUT and VM (RA) and VM to ground (RB) will set the gain of this amplifier. Gain = 1 + RA/RB The amplifier is unity gain stable; however a minimum gain of two is recommended to improve low output voltage accuracy. The amplifier has a bandwidth of 2MHz with a gain of 2. For increased gain applications, the bandwidth is reduced according to the formula: Bandwidth = 4MHz/(Gain) = 4MHz * RB/(RA + RB) A capacitor can be placed across the feedback resistor R A to shape the frequency response. In addition, the amplifier can be used as a comparator. VM can be connected to a reference voltage. When the internal detector output
RFIN
R1 (OPT)
OFFSET ADJUSTMENT
12
U
voltage (which is connected to the positive input of the buffer amplifier) exceeds the external voltage on VM, VOUT will switch high. The VOS input controls the DC input voltage to the buffer amplifier. VOS must be connected to ground if the DC starting voltage is not to be changed. The buffer is initially trimmed nominally to 120mV (Gain = 2x) with VOS connected to ground. The VOS pin is used to change the initial VOUT starting voltage. This function, in combination with gain adjustment enables the LTC5532 output to span the input range of a variety of analog-to-digital converters. VOUT will not change until VOS exceeds 120mV. The starting voltage at VOUT for VOS >120mV is: VOUT = 0.5 * VOS * Gain where gain is the output buffer gain. For a buffer gain of 2x, VOUT will exactly track VOS above 120mV. RF Detector The internal RF Schottky diode peak detector and level shift amplifier convert the RF input signal to a low frequency signal. The detector demonstrates excellent efficiency and linearity over a wide range of input power. The Schottky diode is biased at about 55A and drives a 25pF internal peak detector capacitor.
Demo Board Schematic
VCC 2.7V TO 6V C4 39pF 1 2 3 LTC5532ES6 RFIN VCC 6 5 4 C3 (OPT) R2 10k 1% R3 10k 1% GND
5532 DB
W
U
U
C1 0.1F C2 100pF VOUT
GND VOUT VOS VM
5532f
LTC5532
APPLICATIO S I FOR ATIO
Applications The LTC5532 can be used as a self-standing signal strength measuring receiver for a wide range of input signals from -32dBm to 10dBm for frequencies from 300MHz to 7GHz. Operation at higher frequencies, to 12GHz or above, is achievable with reduced performance. The smaller DFN package version is recommended for these applications because of its lower parasitics. Figure 1 plots the output voltage as a function of RF power of a 12GHz CW input signal.
3600 3200
VOUT OUTPUT VOLTAGE (mV)
TA = 25C
2800 2400 2000 1600 1200 800 400 0 -32 -28 -24 -20 -16 -12 -8 -4 0 RF INPUT POWER (dBm) 4 8
5532 F01
Figure 1. Typical Detector Characteristics, 12GHz, Gain = 2, VOS = 0V (DFN Package)
LTC5532ES6 1 2 OFFSET ADJUSTMENT 3 RFIN VCC 6 5 4 R2 0.1F Li-Ion
GND VOUT VOS VM
Figure 2. Mobile Phone Tx Power Control Application Diagram with a Capacitive Tap
U
The LTC5532 can be used as a demodulator for AM and ASK modulated signals with data rates up to 2MHz. Depending on specific application needs, the RSSI output can be split between two branches, providing AC-coupled data (or audio) output and DC-coupled RSSI output for signal strength measurements and AGC. The LTC5532 can be used for RF power detection and control. Figure 2 is an example of a transmitter power controller, using the LTC5532 with a capacitive tap to the power amplifier. A 0.5pF capacitor (C1) followed by a 200 resistor (R1) form a coupling circuit with about 20dB loss at 900MHz referenced to the LTC5532 RF input pin. In the actual product implementation, component values for the capacitive tap may be different depending on parts placement, PCB parasitics and parameters of the antenna. The LTC5532 can be configured as a comparator for RF power detection and RF power alarms. The characterization data includes a plot of the LTC5532 output delay in response to a positive input step of varying RF level.
TX PA MODULE CELL BAND R1 200 1% C1 0.5pF 0.05pF DIPLEXER PCS BAND R3 MOBILE PHONE DSP VPC
5532 F02
W
UU
BSE
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LTC5532
PACKAGE DESCRIPTIO U
DC Package 6-Lead Plastic DFN (2mm x 2mm)
(Reference LTC DWG # 05-08-1703)
0.675 0.05 2.50 0.05 1.15 0.05 0.61 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 1.42 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP 0.56 0.05 (2 SIDES) 2.00 0.10 (4 SIDES) PIN 1 CHAMFER OF EXPOSED PAD 3 0.200 REF 0.75 0.05 1
(DC6) DFN 1103
0.38 0.05 4 6
PIN 1 BAR TOP MARK (SEE NOTE 6)
0.25 0.05 0.50 BSC
1.37 0.05 (2 SIDES) 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD
NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
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LTC5532
PACKAGE DESCRIPTIO U
S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE ID 0.95 BSC 0.30 - 0.45 6 PLCS (NOTE 3) 0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10 0.09 - 0.20 (NOTE 3) 1.90 BSC
S6 TSOT-23 0302
0.62 MAX
0.95 REF
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.30 - 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC5532
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
LT/TP 0304 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

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