At73c502 differential-ended adc – Rainbow Electronics AT73C502 User Manual
Page 4
AT73C500
4
AT73C502 Differential-Ended ADC
Figure 4. QFP-44 package pin layout
Power
Supply
Pins
Pin
I/O
Description
VDA
12, 13,
29, 30
PWR
Analog Supply, Positive, +5V
VSA
10, 11,
27, 28
PWR
Analog Supply, Negative, 0V
AGND
6
PWR
Analog Ground Reference
Input
VREF 8
PWR
Reference Voltage
Output/Input
VCC
3, 4
PWR
Digital Supply, Positive, +5V
VGND
32
PWR
Digital Supply, Negative, 0V
Crystal
Osc
Signals
Pin
I/O
Description
XI
43
I
Crystal Oscillator Input
XO
44
O
Crystal Oscillator Output
Analog
Signals
Pin
I/O
Description
AIN2P
14
I
Voltage, Channel 1, Positive
AIN2N
15
I
Voltage, Channel 1, Negative
AIN4P
16
I
Voltage, Channel 2, Positive
AIN4N
17
I
Voltage, Channel 2, Negative
CS
BGD
N/C
CLKR
CLK
N/C
N/C
N/C
XI
RESET
XO
32
2
1
33
43
44
42
41
40
39
38
37
36
35
34
DATA
ACK
FSR
VGND
31
PD
30
VDA
29
VDA
28
VSA
27
VSA
26
SINGLE
25
AIN5N
24
AIN5P
23
AIN3N
13
12
14
15
16
17
18
19
20
21
22
VCC
3
VCC
4
PFAIL
5
AGND
6
VCIN
7
VREF
8
N/C
9
VSA
10
VSA
11
AIN1N
AIN6N
AIN4N
AIN2N
VDA
AIN3P
AIN1P
AIN6P
AIN4P
AIN2P
VDA
AIN6P
18
I
Voltage, Channel 3, Positive
AIN6N
19
I
Voltage, Channel 3, Negative
AIN1P
20
I
Current, Channel 1, Positive
AIN1N
21
I
Current, Channel 1, Negative
AIN3P
22
I
Current, Channel 2, Positive
AIN3N
23
I
Current, Channel 2, Negative
AIN5P
24
I
Current, Channel 3, Positive
AIN5N
25
I
Current, Channel 3, Negative
VCIN
7
I
Input to Voltage Monitoring
Block
N/C
9
I
Must be left floating
Digital
Control
Signals
Pin
I/O
Description
BGD
1
I
By-pass Control for
Reference Voltage
CS
2
I
Chip Select Input
PD
31
I
Power Down Control for A/D
Modulators
N/C
33
I
Connect to VGND
RESET
34
I
Reset Input, Active High
SINGLE
26
I
Single / Differential selector.
· Low: Differential
· High or n/c: Single-ended
Status
Flags
Pin
I/O
Description
PFAIL
5
O
Output of Voltage Monitoring
Block
Output
Bus
Signals
Pin
I/O
Description
CLK
41
O
Master Clock Output
CLKR
39
O
Serial Bus Clock Output
DATA
35
O
Serial Data Output
FSR
36
O
Output Sample Frame
Signal
ACK
37
O
Data Ready Acknowledge
Output
Analog
Signals
Pin
I/O
Description