Pre-trimmed Low-voltage Low-power Analog Engine Dynamics Processor IC THAT 4320 FEATURES APPLICATIONS Pre-trimmed VCA & RMS detector Companding noise reduction Wireless microphones Wide supply voltage range: 4.5V~16V Wireless instrument packs Low supply current: 3.7mA typ. (5V) Wireless in-ear monitors Four opamps Battery operated dynamics processors One low-noise opamp (<5nV/rt-Hz) Compressors On board PTAT reference Limiters Wide dynamic range: 120dB as AGCs compander De-essers Description The THAT4320 is a single-chip Analog Engine technology for noise reduction. However, with 22 active optimized for low-voltage, low-power operation. Incor- pins, the part is extremely flexible and can be configured porating a high-performance voltage- controlled ampli- for a wide range of applications including single and fier (VCA), RMS-level sensor, and four opamps, the multi-band companders, compressors, limiters, AGCs, surface mount part is aimed at battery-operated audio de-essers, etc. applications such as wireless microphones, wireless What really sets the 4320 apart is the transparent instruments and in-ear monitors. The 4320 operates from a single supply voltage down to +4.5Vdc, drawing sound of its Blackmer VCA coupled with its accurate only 3.7mA. true-RMS level detector. The IC is useful in battery- powered mixers, compressor/limiters, ENG devices and This IC also works at supply voltages up to 16Vdc, other portable audio products. The part is highly making it useful in line-operated products as well. The VCA is pre-trimmed at wafer stage to deliver low distor- integrated and requires minimal external support tion without further adjustment. And, one opamp is circuitry: it even contains an on-board PTAT (propor- quiet enough to be used as a microphone preamp. tional to absolute temperature) voltage reference to The part was developed specifically for use as a generate thermally compensated control voltages for companding noise reduction system, drawing from thresholds and gain settings. THATs long history and experience with dbx 27 26 25 23 21 20 18 17 16 OUT IN VCA OA3 EC+ EC- V EE V 15 CC 28 THAT V/2 Buffer CC 4320 13 RMS OUT IN 1 CT 14 V V GND PTAT REF 23 4 6 7 8 9 11 Figure 1. THAT4320 equivalent block diagram (QSOP-28 pin assignments shown) THAT Corporation 45 Sumner Street Milford, MA 01757-1656 USA Tel: +1 508 478 9200 Fax: +1 508 478 0990 Email: info thatcorp.com Web: www.thatcorp.com Copyright 2015, THAT Corporation Document 600045 Rev 08Document 600045 Rev 08 Page 2 of 16 THAT4320 Pre-trimmed Low-voltage Low-power Analog Engine Dynamics Processor IC SPECIFICATIONS 1 Absolute Maximum Ratings Positive Supply Voltage (V ) +18V Power Dissipation (P ) at T =85 C 400mW CC D A Supply Current (I ) 30mA Input Voltage Supply Voltage CC Operating Temperature Range (T ) -40 to +85 C Storage Temperature Range (T ) -40 to +125 C OP ST Junction Temperature (T ) -40 to +125 C Lead Temperature Range (Soldering, 10 sec) 300 C J Output Short-Circuit Duration 30 sec 2 Electrical Characteristics Parameter Symbol Conditions Min Typ Max Units Power Supply Positive Supply Voltage V Referenced to GND +4.5 - +16 V CC Negative Supply Voltage (OA)V OA only V -16 0 0 V 1 EE 1 CC Resistive Divider Voltage V When overridden by split supply V - 8 V / 2 GND + 8 V PIN13 CC CC Supply Current ICC No Signal V =+5 V 3.7 6 mA CC V =+15 V 5 10 mA CC I V =+5V, V =-5 V 0.6 - mA EE CC EE Voltage Controlled Amplifier (VCA) Max. I/O Signal Current i + i V = +5 V 500 A IN(VCA) OUT(VCA) CC peak V = +15 V 1 mA CC peak 3 Gain at 0V Control G0 0V at +IN of OA2 -1.5 0 +1.5 dB Gain-Control Constant E /Gain (dB) -60 dB < gain < +40 dB - 6.0 - mV/dB C+ Gain-Control Tempco E / T Ref T =27C - +0.33 - %/C C CHIP CHIP 4 Output Offset Voltage Change V R = 20 k OFF(OUT) OUT 0 dB gain - 1 15 mV +15 dB gain - 3 30 mV +30 dB gain - 10 50 mV Output Noise eN(OUT) 0 dB gain 22Hz~22kHz, R =R =20 k - -98 -95 dBV IN OUT 3 Total Harmonic Distortion THD V = -5dBV, 1kHz, 0V at +IN of OA 0.05 0.1 % IN 2 RMS Level Detector Output Voltage at Reference i e i = 7.5 A RMS -8 0 +8 mV IN O(0) IN Output Error at Input Extremes e i = 200 nA RMS 1 3 dB O(RMS)error IN i = 1 mA RMS 1 3 dB IN 1. If the devices are subjected to stress above the Absolute Maximum Ratings, permanent damage may result. Sustained operation at or near the Absolute Maximum Ratings conditions is not recommended. In particular, like all semiconductor devices, device reliability declines as operating temperature increases. 2. Unless otherwise noted, T =25C, V =+5V, V =0 V. Test circuit is as shown in Figure 2. A CC EE 3. Assumes OA2 is configured for unity gain, & includes offset voltage of OA2. 4. Reference is to output offset with -80 dB VCA gain. THAT Corporation 45 Sumner Street Milford, MA 01757-1656 USA Tel: +1 508 478 9200 Fax: +1 508 478 0990 Email: info thatcorp.com Web: www.thatcorp.com Copyright 2015, THAT Corporation