PIN CONFIGURATION
(MSB) Bit 1
1
2
32 Common (Analog)
31 NC (1)
Bit 2
Bipolar
Bit 3
3
30 –VCC (–15V) Analog
29 Bipolar Offset Current
28 Common (Analog)
27 Ground Sense
26 Comparator Input
25 10V Input
Reference
Bit 4
4
CMOS
Bit 5
Bit 6
5
6
+V DD (+5V) Digital
Common (Digital)
Serial Out
Status
7
1kΩ
2kΩ
8
9
24 20V Input
10
11
12
13
14
15
16
23 –VCC (–15V) Analog
22 +VDD (+5V) Digital(2)
21 Common (Digital)
20 +VCC (+15V) Analog
19 Clock Rate Control
18 Convert Command
17 Clock Out
Bit 7
Bit 8
–
+
Bit 9
545Ω
Bit 10
Bit 11
Bit 12
Clock
(1) NC = No internal connection. Any voltage may be connected to pin 31, however.
(2) Pin 22 must be very cleanly decoupled to keep digital noise out of the analog circuits.
PIN DEFINITIONS
PIN NUMBER
DESIGNATION
DESCRIPTION
1-6 and 11-16
Bit 1 to Bit 12
Serial Out
Status
12-bit parallel output data capable of sinking 3.2mA.
9
12-bit serial data output synchronized with the negative edge of each appropriate clock cycle.
10
Conversionstatusstrobeishighduringdataconversion;lowwhenparalleldataisvalid. Negativeedgemay
be used to latch parallel data, however, appropriate latch set-up time must be provided. Refer to tBBL in the
ADC601 timing diagram.
17
18
Clock Out
Negative edge indicates when serial data is valid. After convert command goes high, fist cycle clocks bit 1
(MSB). The clock continues to run when convert command is high and resets low with convert command.
Convert Command
High transition starts conversion; and should remain high during conversion. Low will reset clock and SAR
logic.
19
24
25
26
27
Clock Rate Control
20V Input
Maybeusedtoincreaseclockspeed,byincreasingthepositiveportionoftheclock.Highisnormaloperation.
20V input range allows ±10Vp-p analog input signal. Short to ground when not used.
10V input range allows 0 to –10Vp-p or ±5Vp-p input range.
10V Input
Comparator In
Ground Sense
Only used in bipolar mode when it is connected to bipolar offset pin through short lead with low resistance.
Ground Sense pin. (See text for use).
29
Bipolar Offset Current
Bipolar offset current short to comparator In through very short lead with very low resistance for bipolar
operation. Short to ground for unipolar operation.
®
ADC601
4
BB [ BURR-BROWN CORPORATION ]
