AD7329 Analog Devices, AD7329 Datasheet - Page 21

• Manufacturer Part Number: AD7329
• Description: 1 MSPS , 8-Channel, Software Selectable True Bipolar Input, 12-Bit Plus Sign A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7329

• Resolution (bits): 13bit
• # Chan: 8
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Uni
• Ain Range: Bip (Vref),Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 2.5V,Bip 5.0V,Uni (Vref),Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

This voltage is set up externally, and its range varies with reference
voltage. As the reference voltage increases, the common-mode
range decreases. When the differential inputs are driven with an
amplifier, the actual common-mode range is determined by the
amplifier’s output swing. If the differential inputs are not driven
from an amplifier, the common-mode range is determined by
the supply voltage on the V
When a conversion takes place, the common mode is rejected,
resulting in a noise-free signal of amplitude −2 × (4 × V
(4 × V
Figure 38. Common-Mode Range for V
Figure 39. Common-Mode Range for V
REF
–1
–2
–3
–4
–5
–6
–2
–4
), corresponding to Digital Codes −4096 to +4095.
5
4
3
2
1
0
8
6
4
2
0
V
V
V
V
CC
REF
CC
REF
= 3V
= 5V
= 3V
= 3V
RANGE
RANGE
±10V
±10V
±16.5V V
±16.5V V
±5V RANGE
±5V RANGE
DD
DD
DD
supply pin and the V
/V
/V
RANGE
RANGE
±2.5V
SS
±2.5V
SS
CC
CC
= 3 V and REF
= 5 V and REF
RANGE
RANGE
±12V V
±12V V
±10V
±10V
±5V RANGE
±5V RANGE
DD
DD
/V
/V
SS
SS
IN
IN
/REF
/REF
SS
RANGE
RANGE
±2.5V
±2.5V
REF
supply pin.
OUT
OUT
) to +2 ×
= 3 V
= 3 V
Rev. A | Page 21 of 40
Figure 40. Common-Mode Range for V
Figure 41. Common-Mode Range for V
–2
–4
–6
–8
–2
–4
–6
–8
8
6
4
2
0
6
4
2
0
V
V
V
V
CC
REF
CC
REF
= 5V
= 3V
= 2.5V
= 2.5V
RANGE
RANGE
±10V
±10V
±16.5V V
±16.5V V
±5V RANGE
±5V RANGE
DD
DD
/V
/V
RANGE
RANGE
SS
±2.5V
SS
±2.5V
CC
CC
= 3 V and REF
= 5 V and REF
RANGE
RANGE
±12V V
±12V V
±10V
±10V
±5V RANGE
±5V RANGE
DD
DD
/V
/V
SS
SS
IN
IN
/REF
/REF
RANGE
RANGE
AD7329
±2.5V
±2.5V
OUT
OUT
= 2.5 V
= 2.5 V