ALD500 ALD [Advanced Linear Devices], ALD500 Datasheet - Page 6

• Manufacturer Part Number: ALD500
• Description: PRECISION INTEGRATING ANALOG PROCESSOR
• Manufacturer: ALD [Advanced Linear Devices]

Table 1. Conversion Phase and Control Logic Internal Analog Switch Functions
Conversion
Phase
Auto Zero
Input Signal
Integration
Reference Voltage
Deintegration
Integrator
Output Zero
*SW +
PIN DESCRIPTION
Pin No.
6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
R
would be closed for a positive input signal. SW -
C
V
C
BUF
AGND
C
C
V
V
V
V
A
B
C
DGND
V
Symbol
-
-
+ REF
- IN
+ IN
+
INT
AZ
- REF
+ REF
OUT
REF
A = 0, B = 1
A = 1, B = 0
A = 1, B = 1
A = 0, B = 0
Control
Logic
Integrator capacitor connection.
Negative power supply.
The Auto-zero capacitor connection.
The Integrator resistor buffer connection.
This pin is analog ground.
Negative reference capacitor connection.
Positive reference capacitor connection.
External voltage reference (-) connection.
External voltage reference (+) connection.
Negative analog input.
Positive analog input.
Converter phase control MSB Input.
Converter phase control LSB Input.
Comparator output. C
Digital ground.
Positive power supply.
Description
is LOW when a negative input voltage is being integrated. A HIGH-to-LOW transition on C
that the Deintegrate phase is completed. C
time the Integrator Zero phase.
Connect
Input
Closed
SW
Open
Open
Open
IN
OUT
Reference Input
SW
is HIGH during the Integration phase when a positive input voltage is being integrated and
R
would be closed for a negative input signal.
Polarity
Advanced Linear Devices
+ R or
Closed*
Open
Open
Open
SW
- R
OUT
is undefined during the Auto-Zero phase. It should be monitored to
Auto Zero
Switch Functions
SW
Closed
Open
Open
Open
AZ
Reference
Sample
Closed
Closed
SW
Open
Open
R
V
IN
ALD500AU/ALD500A/ALD500
Closed
Closed
Closed
=AGND
SW
Open
OUT
G
signals the processor
System
Offset
Closed
SW
Open
Open
Open
S