Rainbow Electronics AT73C502 - 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