PCM78P Datasheet, PDF (3/16 Pages) Burr-Brown (TI) – 16-Bit Audio ANALOG-TO-DIGITAL CONVERTER

PIN ASSIGNMENTS
PIN NAME
I/O DESCRIPTION
1 Analog In
I Analog Signal Input (1.5kΩ impedance).
2 –V_CC
3 MSB Adjust
I Analog power supply (–5V to –15V).
I Internal adjustment point to allow adjustment of MSB major carry.
4 +V_DD
5 No Connection
I Power connection for comparator (+5V).
— No internal connection.
6 Comparator Common I Comparator common connection. Connect to ground.
7 MSB
O Parallel output of bit 1 (MSB) inverted.
8 BTC/BOB Select
I Two’s complement (open) or straight binary (grounded) data output format selection.
9 Status
O Output signal held high until conversion is complete.
10 Clock Out
O 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).
11 R₁C₁
12 R₂C₂
13 S_OUT2
14 +V_DD
15 S_OUT1
16 External Clock
I RC connection point used to generate internal clock. Sets clock high time. See text for details.
I RC connection point used to generate internal clock. Sets clock low time. See text for details.
O Internal shift register containing the previous conversion result. (Alternate latched data output mode).
I Power connection for +5V logic supply.
O Primary real-time data output synchronized to clock out.
I External clock input point (internal clock must be disabled).
17 Int/Ext Clock Select
I Selects either internal or external clock mode (low = internal; open = external).
18 Short Cycle
I Terminates conversion at less than 16 bits (open for 16-bit mode). See text for details.
19 Convert Command
I Starts conversion process (can optionally be generated internally).
20 S_OUT2 Latch
I Latches previous conversion result for readout (must be issued with the S_OUT2 clock to initiate latch and an internal convert
command).
21 S_OUT2 Clock
22 Digital Common
I Used to read out internally latched data from previous conversion.
I Digital grounding pin.
23 +V_CC
I Analog supply connection (+5V to +15V).
24 V_POT
O Voltage output (~2.5V) for optional adjustment of MSB transition.
25 Reference Decouple I Reference decoupling point.
26 Analog Common
I Analog grounding pin.
27 Reference Out
O 2V reference out. Should not be used except as shown in connection diagram.
28 Speed Up
I Connection point for a capacitor to speed reference settling. See text for details.
NOTE: Analog and digital commons are connected internally.
INPUT/OUTPUT RELATIONSHIPS
ANALOG INPUT
+2.999908V
–3.000000V
0.000000V
–0.000092V
CONDITION
+ Full Scale
–Full Scale
Bipolar Zero
Zero-1 LSB
DIGITAL OUTPUT
BTC
BOB
7FFF Hex
8000 Hex
0000 Hex
FFFF Hex
FFFF Hex
0000 Hex
8000 Hex
7FFF Hex
PACKAGE INFORMATION
MODEL
PACKAGE
PACKAGE DRAWING
NUMBER⁽¹⁾
PCM78P
28-Pin Plastic DIP
215
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
ABSOLUTE MAXIMUM RATINGS
+V_CC to Analog Common ......................................................... 0 to +16.5V
–V_CC to Analog Common ......................................................... 0 to –16.5V
–V_DD to Analog Common .............................................................. 0 to +7V
Analog Common to Digital Common ................................................. ±0.5V
Logic Inputs to Digital Common ................................. –0.3V to V_DD + 0.5V
Analog Inputs to Analog Common .................................................. ±16.5V
Lead Temperature (soldering, 10s) ................................................ +300°C
Stresses above these ratings may permanently damage the device.
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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PCM78