Low-Noise, Differential Audio Preamplifier IC THAT1580 FEATURES APPLICATIONS Low Noise: Microphone Preamplifiers -134.8dBu (1nV/Hz) EIN 60dB gain Digitally-Controlled Microphone Low THD+N: Preamplifiers 0.0003% 3 - 30 dB gain 0.0005% 40 dB gain Differential Low-Noise Preamplifiers Low Current: 7.9 mA typ Differential Summing Amplifiers Wide Bandwidth: 2.7MHz 40dB gain Differential Variable-Gain Amplifiers High Slew Rate: 53 V/s Moving-Coil Transducer Amplifiers Wide Output Swing: +29.8 dBu (18V supplies) Line Input Stages Gain adjustable from 0 to >60 dB Audio Differential output Sonar Small 4 x 4mm QFN16 package Instrumentation Mates with THAT s family of Digital Preamplifier Controller ICs Description The THAT1580 is a versatile, high performance range of gains than is possible with fixed R and R . A B current-feedback amplifier suitable for differential The 1580 s differential output simplifies connec- microphone preamp and bus summing applications. tion to differential input devices such as A/D convert- The IC comes in a small 4 x 4 mm QFN package, ers. The part operates from as little as 5V up which saves PCB space over discrete and other inte- through 18V supplies. Running on 18V supplies, grated solutions. at unity gain, the part accepts >+28.3 dBu input signals and will deliver up to +29.8 dBu (differential) Gain is adjusted via three external resistors (R , R , A B output signals. and R ), making it possible to optimize noise over a G The 1580 is designed to mate perfectly with wide range of gains. The 1580 supports the traditional THAT s series of Digital Preamplifier Controller ICs. approach to gain control (viz., THAT s 1510 or 1512) by fixing R and R , and varying R to control gain. How- A B G Designed from the ground up in a high-voltage ever, the 1580 also supports varying all three resistors BiCMOS process, the 1580 improves on existing simultaneously with a dual-gang potentiometer or a integrated microphone preamps by offering more switched resistor network. This flexible approach versatile gain configuration, lower noise at low gains, enables the designer to optimize noise over a wider higher slew rate, and lower distortion. Pin Name QFN Pin N/C* 1 OUT2 2 OUT1 3 N/C* 4 N/C* 5 Rg1 6 IN1 7 N/C* 8 N/C* 9 IN2 10 N/C* 11 V- 12 V+ 13 N/C* 14 Rg2 15 N/C* 16 V- Thermal Pad Table 1. Pin Assignments Figure 1. THAT1580 Block Diagram * N/C pins should be left open and not connected to other traces on the PCB THAT Corporation 45 Sumner Street Milford, Massachusetts 01757-1656 USA Tel: +1 508 478-9200 Fax +1 508 478-0990 Web: www.thatcorp.com Copyright 2016, THAT Corporation Doc 600187 Rev 01 THAT 1580 Low-Noise Page 2 of 16 Document 600187 Rev 01 Differential Audio Preamplifier IC 1 , 2 SPECIFICATIONS 3 Absolute Maximum Ratings Supply Voltage (V+) - (V-) 40 V Operating Temperature Range (T ) -40 to +85 C OP Maximum Input Voltage (V ) V+ to V- Output Short-Circuit Duration (t ) Continuous IMax SH Storage Temperature Range (T ) -40 to +125 C Junction Temperature (T ) +125 C STG JMAX 4,5 Electrical Characteristics Parameter Symbol Conditions Min Typ Max Units Power Supply Supply Voltage V+ - V- Referenced to GND 5 18 V Supply Current I+ -(I-) No Signal 7.9 10 mA Input Characteristics Input Bias Current I No signal either input connected to GND 6.8 11 A B Input Offset Current I No signal -1.1 +1.1 A B-OFF R Input Bias Current I No signal -20 +1.5 +20 A G BRG R Input Offset Current I No signal -3.5 +3.5 A G BRG-OFF Differential Input Offset Voltage V No signal, Includes I * R OS BRG-OFF F 0 dB gain -10 +10 mV +60 dB gain -250 +250 V Input Common Mode Voltage Range V Common Mode (V-) + 3.7 (V+) - 3.2 V IN CM Maximum Differential Input Level V R = 26 dBu IN-BAL G Output Characteristics Total Differential Output Offset G = gain -(10 + 0.25*G) (10 + 0.25*G) mV Common Mode Output Voltage V No signal IN1, IN2 connected to GND -640 mV OSCM Maximum Single Output Voltage V R = 2 k (V+) -1, (V-)+1 V OUT-SINGLE L Differential Short Circuit Current I Cold Start R = 0 62 mA SC L Maximum Capacitive Load C Over entire temperature range 100 pF L MAX Maximum Differential Output Level V R = 2 k 28 dBu OUT L AC Characteristics Gain Equation G Differential in to differential out 1 + (R + R )/R DIFF A B G See Figure 16. (R = R + R ) G GV GF Feedback Impedance R , R 2 k A B Differential Gain G Programmed by R , R , R 0 70 dB DIFF A B G Power Supply Rejection Ratio PSRR V+ = -(V-) 5V to 18V 0 dB gain 111 dB 20 dB gain 122 dB 40 dB gain 147 dB 60 dB gain 147 dB Bandwidth -3dB f Small signal -3dB 0 dB gain 7.3 MHz 20 dB gain 6.1 MHz 40 dB gain 2.7 MHz 60 dB gain 356 kHz Small signal R = G R = R = 2 k 8 MHz A B R = R = 5 k 3 MHz A B R = R = 10 k 1.3 MHz A B 1. All specifications are subject to change without notice. 2. Unless otherwise noted, T =25C, V+ = +15V, V- = -15V. A 3. Stresses above those listed underAbsolute Maximum Rating may cause permanent damage to the device. These are stress ratings only the functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 4. 0 dBu = 0.775 Vrms 5. Unless otherwise noted, R = R = 2.21 k C = 10 pF A B L THAT Corporation 45 Sumner Street Milford, Massachusetts 01757-1656 USA Tel: +1 508 478-9200 Fax +1 508 478-0990 Web: www.thatcorp.com Copyright 2016, THAT Corporation All rights reserved.