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| T H AT Corporation FEATURES * * * * * * * * Excellent noise performance through the entire gain range Exceptionally low THD+N over the full audio bandwidth Low power consumption: 7mA typ. Wide bandwidth: 3MHz typ. @ G=1000 (THAT 1510) High Slew Rate: 28 V/ms @ G=10 and CL=50pF (THAT 1510) Wide Output Swing: 13V typ. on 15V supplies Gain adjustable from 1 to >1000 with a single external resistor Drop-in compatible with SSM-2017 (THAT 1510) * * * * * * * Low Noise, High Performance Microphone Preamplifier IC THAT 1510, 1512 APPLICATIONS Mixing Consoles Public Address Systems Analog and Digital Snakes Breakout Boxes for Digital Systems Sonar Paging and Intercom systems Instrumentation Description The THAT 1510 and 1512 are high performance audio preamplifiers suitable for microphone preamp and bus summing applications. The ICs are pin compatible with the Analog Devices SSM2017 in both the 8-pin DIP and 16-pin SOIC packages. The THAT1512 follows a different gain equation than the 1510, but exhibits significantly lower noise at lower gain settings and is recommended for new designs. Designed from the ground up in THAT's complementary bipolar, dielectric isolation process, the THAT 1510 and 1512 improve on existing integrated microphone preamps by offering lower noise at low gains, better distortion characteristics, lower power consumption, higher slew rate and bandwidth, and increased output voltage swing. The parts are fully protected against ESD on all critical pins, and reliability is further enhanced by their reduced power requirements. In short, the THAT 1510 and 1512 provide superior performance in a popular format at an affordable price. V+ 5k (10k) +1 +1 Pin Name RG1 DIP 1 2 3 4 5 6 7 8 SO16 2 4 5 7 10 11 13 15 5k + Out -In +In VRef Out V+ RG2 -In +In 5k RG1 RG2 5k 5k (10k) 5k Ref Table 1. 1510 / 1512 pin assignments Gain Equation G = 1+ 10kW RG 5 kW RG DIP-8 1510P 1512P SO16 1510S 1512S VFigure 1. THAT 1510 / 1512 Equivalent Circuit Diagram (THAT 1512 values shown in parentheses) G = 0.5 + Table 2. Ordering Information THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com Page 2 THAT 1510 / 1512 Microphone Preamplifier Preliminary Information SPECIFICATIONS 1 Absolute Maximum Ratings (T A = 25C) Positive Supply Voltage (VCC) Negative Supply Voltage (VEE) Output Short-Circuit Duration (tSH) Lead Temp. (TLEAD) (Soldering 10 sec) +20 V -20 V Continuous 260 C Operating Temperature Range (TOP) Storage Temperature Range (TST) Junction Temperature (TJ) -40 to +85C -40 to +125C 150C Recommended Operating Conditions Parameter Positive Supply Voltage Negative Supply Voltage Symbol VCC VEE Conditions Min +5 -5 Typ Max +20 -20 Units V V Electrical Characteristics Parameter Supply Current Input Bias Current Input Offset Current Output Referred Offset Voltage Input Referred Offset Voltage Input Voltage Range Common Mode Normal Mode Differential Gain Ref Input Voltage Range Ref Input Impedance Ref Input Gain to Output Input Impedance ZIN-DIFF Differential 0dB gain 20dB gain 40dB gain 60dB gain Common mode all gains Symbol ICC, |IEE| IB IB-OFF VosOR VosIR VIN-CM VIN-UNBAL Gdiff Conditions No signal VCC = |VEE| = 20V No signal; Either input connected to GND No signal No Signal, VCM=0 60 dB gain Common mode, all gains Min -- -- -- -- -- -- -- 1510 Typ 6.1 -- 8.6 -- -- -- 13 13 -- 8 10 0 2 Max 8.2 8.4 25 2.5 50 1.2 -- -- 70 -- -- -- Min -- -- -- -- -- -- -- -- 0 -- -- -- 1512 Typ 6.1 -- 8.6 -- -- -- 13 13 -- 8 15 0 Max 8.2 8.4 25 2.5 25 1.2 -- -- 60 -- -- -- Units mA mA mA mA mV mV V V dB V kW dB Unbalanced -- One input to GND, 0dB gain 0 -- -- -- -- -- -- -- -- 32||1.9 32||2.0 32||2.5 29||8.0 8||7.7 -- -- -- -- -- -- 37||1.9 -- 37||2.0 -- 36||3.1 -- 31||13.9 -- 9||7.7 -- -- -- -- -- MW||pF MW||pF MW||pF MW||pF MW||pF ZIN-CM 1. All specifications are subject to change without notice. 2. Unless otherwise noted, VCC = +15V, VEE = -15V, TA=25C, THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com 600031 Rev. 7/23/02 Preliminary Information Page 3 Electrical Characteristics (Cont'd) Parameter Common Mode Rejection Symbol CMR Conditions VCM = 10V; DC to 60 Hz 0 dB gain 20 dB gain 40 dB gain 60 dB gain Min 20 40 60 80 1510 Typ 55 75 95 115 85 105 120 124 Max -- -- -- -- -- -- -- -- Min 20 40 60 80 -- -- -- -- 1512 Typ 55 75 95 115 85 105 120 124 Max -- -- -- -- -- -- -- -- Units dB dB dB dB dB dB dB dB Power Supply Rejection PSR VCC= |VEE|; 5V to 20V; DC to 60 Hz 0 dB gain -- 20 dB gain -- 40 dB gain -- 60 dB gain -- VOUT = 7Vrms; RL = 5 kW f = 1kHz; BW = 20 kHz 0 dB gain 20 dB gain 40 dB gain 60 dB gain f = 20kHz; BW = 80 kHz 0 dB gain 60 dB gain f = 1kHz, 0dB gain 20dB gain 40dB gain 60dB gain 60dB gain 60dB gain RS = 150 W RS = 200 W RL = 2 kW CL = 50 pF RL = 2 kW; CL = 10 pF 0dB gain 20dB gain 40dB gain 60dB gain f = 1kHz; RL = 2 kW 0dB gain 20dB gain 40dB gain 60dB gain RL = 2 kW all gains RL = 0 W Total Harmonic Distortion THD+N -- -- -- -- -- -- 0.0005 0.0005 0.0005 0.005 0.002 0.005 -- -- -- -- -- -- -- -- -- -- -- -- 0.0005 0.0005 0.0005 0.005 0.002 0.005 -- -- -- -- -- -- % % % % % % Equivalent Input Noise en(OUT) -- -- -- -- -- -- -- 16 -- -- -- -- -- -- -- -- 13 -- -- -- 57 7 1.7 1 2.3 1.6 1.3 28 15 8 7 3 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 16 -- -- -- -- -- -- -- -- 13 -- -- -- 34 4.6 1.4 1 2.3 1.6 1.3 24 11 9 7 1.6 -- -- -- -- -- -- -- -- -- -- nV/OHz nV/OHz nV/OHz nV/OHz pA/OHz dB dB V/ms MHz MHz MHz MHz dB dB dB dB V mA kW pF Input Current Noise Noise Figure in NF Slew Rate Bandwidth -3dB SR BW-3dB Output Gain Error GER (OUT) 0.25 1 0.20 1 0.20 1 0.05 0.5 13.3 17 2 -- -- -- -- 200 10 kW RG 0.25 1 0.20 1 0.20 1 0.05 0.5 13.3 17 2 -- -- -- -- 200 5 kW RG Output Voltage Swing Output Short Circuit Current Minimum Resistive Load Maximum Capacitive Load Gain Equation Gain Resistor (ideal values) VO ISC RLmin CLmax G = 1+ RG 0dB gain 20dB gain 40dB gain 60dB gain G = 0.5 + 10k 526.3 50.3 5 1,100 101 10 W W W W THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com Page 4 THAT 1510 / 1512 Microphone Preamplifier Preliminary Information +15 C6 -In C1 470p R1 1k 100n 2 -In 7 8 RG2 V+ +In C2 470p C3 47p 6 Out Out RG Ref 1 RG1 V- 5 U1 THAT 3 +In 4 1510/1512 C9 R2 1k 100n -15 Figure 2. Basic 1510 / 1512 Circuit Applications Gain Setting A single external resistor between the RG1 and RG2 pins is all that is needed to set the gain of the THAT 1510 / 1512, according to the formulae for the 1510: for the 1512: G =1+ 10 kW RG 5 kW RG or or RG = 10 kW G-1 5 kW G - 0.5 For unity gain operation on the 1510, RG1 and RG2 may be left open. RG should be set to 10kW in the 1512. To avoid excess noise and ensure temperature stability, non-inductive wirewound or metal-film resistors are recommended for RG. Total gain accuracy will depend on both the tolerance on RG, and on the gain equation accuracy of the THAT 1510/1512. Total gain drift will result from the mismatch between the tempco of RG and the G = 0.5 + RG = +15 C6 -In C1 470p R1 1k RG +In C2 470p R2 1k 100n 2 8 -In 7 RG2 V+ U1 THAT 1510/1512 Out Out 6 Ref 1 RG1 V5 3 +In 4 C9 100n -15 U2 6 C8 100n 2 3 R3 510k C3 47p 353 Figure 3. 1510 / 1512 Circuit with Output Offset Correction THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com 600031 Rev. 7/23/02 Preliminary Information Page 5 +48V +15 InR6 6k8 C6 C4 47u R5 6k8 C5 C3 47p 47u R3 51R R1 1k D3 1N5818 D5 1N5818 RG D4 1N5818 R2 1k D6 1N5818 1 RG1 V3 +In 4 2 8 -In RG2 100n 7 V+ Out 6 C1 470p Out In+ C2 470p R4 51R Ref 5 U1 THAT 1510 C9 D1 1N757 D2 1N757 -15 100n Figure 4. Typical 1510 / 1512 Circuit with Phantom Power tempco of the internal resistors (20 ppm/C typical). Noise Performance Thoughtful design results in these devices having significantly lower noise at low gains than similar IC microphone preamps. At zero dB gain, equivalent input noise of the THAT 1510 is 55 nV/OHz, nearly 6 dB better than competitive IC designs. The unusual topology of the THAT 1512 results in an equivalent input noise of 34 nV/OHz at zero dB gain, which makes it comparable to some of the better discrete designs currently available. At 1 kHz, the equivalent input noise for both devices is 1 nV/OHz at 60 dB gain. Four different schemes are shown in Figures 2, 3, 4, and 5. Note that the values of R1 and R2 in these figures should be kept small to minimize pickup of unwanted noise and interference. A value of 1 kW is often used, since some microphones require a differential input impedance of this magnitude. Unfortunately, one would usually desire a significantly higher common mode input impedance to minimize the common mode degradation caused by unbalanced source impedances. Figure 5 shows a technique which allows higher common mode input impedance while maintaining a lower differential source impedance. Reference Terminal The "Ref" pin provides the reference for the output signal, and is normally connected to analog ground. If necessary, the "Ref" pin can be used for offset correction or DC level shifting. A non-zero reference source resistance will reduce the IC's common-mode rejection (CMR) by the ratio of 10 kW/RREF. Inputs Protection diodes are employed at all pins except V+ and V- of the THAT 1510/1512. These diodes reduce the likelihood of accidental ESD/EOS damage to the IC. Other diodes across the base-emitter junctions of the input transistors prevent reverse bias of these junctions and consequent degradation of their noise performance. The inputs of the THAT 1510 and1512's are floating, so a dc bias connection is required to maintain the inputs within the IC's input common-mode range. Phantom Power Phantom power is required for condensor microphones. A phantom power circuit is shown in Figure 4. Diodes D1 through D6 are necessary to protect the THAT 1510/1512 from transient voltages THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com Page 6 THAT 1510 / 1512 Microphone Preamplifier Preliminary Information +48V +15 R6 6k8 C6 C4 47u R9 2k7 R5 6k8 C5 47u C3 47p +15 -15 R4 4R7 R2 10k D4 SB160 D2 SB160 R3 4R7 D3 SB160 D1 SB160 R1 10k 2 -In 8 RG2 RG 100n 7 V+ -In C1 470p C2 470p +In 6 Out Out Ref 1 RG1 V- 5 U1 3 +In THAT 4 1510/1512 C9 100n -15 Figure 5. Preferred 1510 / 1512 Circuit with Multiple Phantom Power that may occur when microphones are connected or disconnected. While figure 4 shows a protection scheme that reflects the current industry practice, a better solution is shown in figure 5. Like figure 4, this circuit uses a diode bridge (composed of very fast 1N5818s), but in this case, the diodes are connected directly to the power supply rails. While this arrangement doesn't keep the inputs inside the common mode range, it has the advantage of working even when the power is off. For further insights in to this subject, see The 48 Volt Phantom Menace, by Gary K. Hebert and Frank W. Thomas, presented at the 110th AES Convention. Package Information The THAT 1510 and 1512 are available in 8-pin DIP and 16-pin SOIC packages. The package dimensions are shown in Figures 6 and 7 while pinouts are given in Table 1. Figure 6. -P (8-pin DIP) version package outline Figure 7. -S16 (16-pin SO) version package outline THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 508 478-9200; Fax: +1 508 478-0990; Web: www.thatcorp.com |
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