ADC4320 Analogic Corporation, ADC4320 Datasheet - Page 5

• Manufacturer Part Number: ADC4320
• Manufacturer: Analogic Corporation

SPECIFICATIONS
Figure 10. ADC4322 SFDR vs Input Level @
195 kHz ±2.5V Range
Figure 11. ADC4322 SFDR vs Input Level @
495 kHz ±2.5V Range
Figure 12. ADC4322 SFDR vs Input Level @
980 kHz ±2.5V Range
true 16-bit performance, avoiding degradation due to
ground loops, signal coupling, jitter and digital noise in-
troduced when separate S/H and A/D converters are in-
terconnected. Furthermore, the accuracy, speed, and
quality of the ADC432X Series are fully ensured by thor-
ough, computer-controlled factory tests of each unit.
INTERFACING
Input Scaling
The converters can be configured for four input voltage
ranges: 0 to +10V; ±2.5V; ±5V; and ±10V. The analog
input range should be scaled as close as possible to the
maximum input to utilize the full dynamic range of the
converter. Figure 13 describes the input connections.
Coding and Trim Procedure
Figure 15 shows the output coding and trim calibration
voltages of the converter. For two’s complement opera-
tion, simply use the available B1 (MSB) instead of B1
(MSB). Refer to Figure 14 for use of external offset and
gain trim potentiometers. Voltage DACs with a ±5V out-
put can be utilized easily when digital control is required.
The input sensitivity of the external offset and gain con-
trol pins is 300 ppm FSR/V. If Offset and Gain adjusts
are not used, connect them to Pin 14, Analog Returns.
To trim the offset of the converter, apply the offset volt-
age shown in Figure 15 for the appropriate voltage
range. Adjust the offset trim potentiometer such that
the 15 MSBs are “0” and the LSB alternates equally
between “0” and “1” for the unipolar ranges or all 16
bits are in transition for the bipolar ranges.
To trim the gain of the converter, apply the range (+FS)
voltage shown in Figure 15 for the appropriate range.
Adjust the gain trim potentiometer such that the 15
MSBs are “1” and the LSB alternates equally between
“0” and “1”.
Figure 13. Input Scaling Connections.
Continued from page 1.
PIN #
RANGE
0V to +10V
±5V
±2.5V
±10V
S/H IN 1
Input
Input
Input
Input
4
SIG RTN
S/H IN2
Input
Input
Input
5
SIG RTN
SIG RTN
S/H IN 3
–5V Ref
Input
6