|Category||Data Conversion => ADC (Analog to Digital Converters) => >14 bit => 16 bit|
|Company||Texas Instruments, Inc.|
|Datasheet||Download PCM78 datasheet
q LOW COST/HIGH PERFORMANCE 16-BIT AUDIO A/D CONVERTER q FAST 5µs MAX CONVERSION TIME (4µs typ) q VERY LOW THD+N ( typ 88dB at FS; max q ±3V INPUT RANGE q TWO SERIAL OUTPUT MODES PROVIDE VERSATILE INTERFACING q COMPLETE WITH INTERNAL REFERENCE AND CLOCK IN 28-PIN PLASTIC DIP TO ±15V SUPPLY RANGE (600mW Power Dissipation)APPLICATIONS
q DSP DATA ACQUISITION q TEST INSTRUMENTATION q SAMPLING KEYBOARD SYNTHESIZERS q DIGITAL AUDIO TAPE q BROADCAST AUDIO PROCESSING q TELECOMMUNICATIONSDESCRIPTION
The is a low-cost 16-bit analog-to-digital converter which is specifically designed and tested for dynamic applications. It features very fast, low distortion performance (4µs/88dB THD+N typical) and is complete with internal clock and reference circuitry. The PCM78P is packaged in a reliable, lowcost 28-pin plastic DIP and data output is available in user-selectable serial output formats. The PCM78P is ideal for digital audio tape (DAT) recorders. Many similar applications such as digital signal processing and telecom applications are equally well served by the PCM78P. The PCM78P uses a SAR technique. Analog and digital portions are efficiently partitioned into a highspeed, bipolar section and a low-power CMOS section. The PCM78P has been optimized for excellent dynamic performance and low cost.
16-bit SAR + Timing Control Internal Clock Circuit Serial Output 1 Serial Output 2 Clock Output Status
International Airport Industrial Park Mailing Address: PO Box 11400 Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd. Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132SPECIFICATIONS
= +25°C, +VDD = +5V, and ±VCC = ±12V, and one minute warm-up in convection environment, unless otherwise noted. PCM78P PARAMETER RESOLUTION INPUT/OUTPUT ANALOG INPUT Input Range Input Impedance DIGITAL INPUT/OUTPUT Logic Family Logic Level: VIH VIL VOH VOL Data Format Convert Command Pulse Width CONVERSION TIME DYNAMIC CHARACTERISTICS SIGNAL-TO-NOISE RATIO 10kHz (0dB) TOTAL HARMONIC 90kHz (0dB) TOTAL HARMONIC DISTORTION 90kHz (0dB) TRANSFER CHARACTERISTICS ACCURACY Gain Error Bipolar Zero Error Differential Linearity Error Integral Linearity Error Missing Codes DRIFT Gain Bipolar Zero POWER SUPPLY SENSITIVITY +VCC VCC +VDD POWER SUPPLY REQUIREMENTS Voltage Range: +VCC VCC +VDD Current: +VCC VCC +VDD Power Dissipation TEMPERATURE RANGE Specification Storage Operating 4.75 +4.75 +VCC = +12V VCC = 12V +VDD = +5V ±VCC to +70°C None % of FSR 14 Bits(8) ppm/°C ppm of FSR/°C %FSR/%V CC %FSR/%V CC %FSR/%V = 200kHz/T CONV = 200kHz/T CONV 3 1.5 TTL Compatible CMOS Serial BOB or BTC (1) Negative Edge V k CONDITIONS MIN TYP MAX 16 UNITS Bits
NOTES: (1) When convert command is high, converter in a halt/reset mode. Actual conversion begins on negative edge. See detailed text on timing for convert command description when using external clock. (2) Ratio of Noise rms/Signal rms. f = input frequency; fS = sample frequency (PCM78P and SHC702 in combination); BW = bandwidth of output (based on FFT or actual analog reconstruction using a 20kHz low-pass filter). (4) Referred to input signal level. (5) Ratio of Distortion rms/Signal rms. (6) Ratio of Distortion rms + Noise rms/Signal rms. (7) FSR: Full-Scale Range 6Vp-p. (8) Typically no missing Codes at 14-bit resolution.
PIN NAME Analog In VCC MSB Adjust +VDD No Connection Comparator Common MSB BTC/BOB Select Status Clock Out R2C2 SOUT2 +VDD SOUT1 External Clock Int/Ext Clock Select Short Cycle Convert Command SOUT2 Latch SOUT2 Clock Digital Common +VCC VPOT Reference Decouple Analog Common Reference Out Speed Up I/O DESCRIPTION Analog Signal Input (1.5k impedance). Analog power supply to 15V). Internal adjustment point to allow adjustment of MSB major carry. Power connection for comparator (+5V). No internal connection. Comparator common connection. Connect to ground. Parallel output of bit 1 (MSB) inverted. Two's complement (open) or straight binary (grounded) data output format selection. Output signal held high until conversion is complete. Internal clock output generated from RC network on pins 11 and 12 (also present when external clock is used lagging external clock by ~24ns and same duty cycle). RC connection point used to generate internal clock. Sets clock high time. See text for details. RC connection point used to generate internal clock. Sets clock low time. See text for details. Internal shift register containing the previous conversion result. (Alternate latched data output mode). Power connection for +5V logic supply. Primary real-time data output synchronized to clock out. External clock input point (internal clock must be disabled). Selects either internal or external clock mode (low = internal; open = external). Terminates conversion at less than 16 bits (open for 16-bit mode). See text for details. Starts conversion process (can optionally be generated internally). Latches previous conversion result for readout (must be issued with the SOUT2 clock to initiate latch and an internal convert command). Used to read out internally latched data from previous conversion. Digital grounding pin. Analog supply connection to +15V). Voltage output (~2.5V) for optional adjustment of MSB transition. Reference decoupling point. Analog grounding pin. 2V reference out. Should not be used except as shown in connection diagram. Connection point for a capacitor to speed reference settling. See text for details.NOTE: Analog and digital commons are connected internally.
DIGITAL OUTPUT ANALOG INPUT 0.000000V 0.000092V CONDITION + Full Scale Full Scale Bipolar Zero Zero-1 LSB BTC 7FFF Hex 8000 Hex 0000 Hex FFFF Hex BOB FFFF Hex 0000 Hex 8000 Hex 7FFF Hex
+VCC to Analog Common......................................................... to +16.5V VCC to Analog Common......................................................... to 16.5V VDD to Analog Common.............................................................. to +7V Analog Common to Digital Common................................................. ±0.5V Logic Inputs to Digital Common................................. 0.3V to VDD + 0.5V Analog Inputs to Analog Common.................................................. ±16.5V Lead Temperature (soldering, 10s)................................................ +300°C Stresses above these ratings may permanently damage the device.
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
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