AD7328BRUZ Analog Devices Inc, AD7328BRUZ Datasheet - Page 19

• Manufacturer Part Number: AD7328BRUZ
• Description: IC ADC 12BIT+ SAR 8CHAN 20TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7328BRUZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Design Resources: Using AD7328 in Appls with Single-Ended Industrial-Level Signals (CN0047)
• Number Of Bits: 12
• Sampling Rate (per Second): 1M
• Number Of Converters: 1
• Power Dissipation (max): 30mW
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP (0.173", 4.40mm Width)
• Resolution (bits): 13bit
• Sampling Rate: 1MSPS
• Input Channel Type: Pseudo Differential, Single Ended
• Supply Current: 900µA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7328CBZ - BOARD EVALUATION FOR AD7328
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

Figure 37. Common-Mode Range for V
Figure 35. Common-Mode Range for V
Figure 36. Common-Mode Range for V
–1
–2
–3
–4
–5
–6
–2
–4
–2
–4
–6
–8
5
4
3
2
1
0
8
6
4
2
0
6
4
2
0
V
V
V
V
V
V
CC
REF
CC
REF
CC
REF
= 3V
= 5V
= 3V
= 3V
= 3V
= 2.5V
RANGE
RANGE
RANGE
±10V
±10V
±10V
±16.5V V
±16.5V V
±16.5V V
±5V RANGE
±5V RANGE
±5V RANGE
DD
DD
DD
/V
/V
/V
RANGE
RANGE
RANGE
±2.5V
SS
±2.5V
±2.5V
SS
SS
CC
CC
CC
= 3 V and REFIN/OUT = 2.5 V
RANGE
= 3 V and REFIN/OUT = 3 V
RANGE
= 5 V and REFIN/OUT = 3 V
RANGE
±12V V
±12V V
±12V V
±10V
±10V
±10V
±5V RANGE
±5V RANGE
±5V RANGE
DD
DD
DD
/V
/V
/V
SS
SS
SS
RANGE
RANGE
RANGE
±2.5V
±2.5V
±2.5V
Rev. B | Page 19 of 36
Pseudo Differential Inputs
The AD7328 can have four pseudo differential pairs or seven
pseudo differential inputs referenced to a common V
V
amplitude within the selected range for that channel as program-
med in the range register. A dc input is applied to the V
The voltage applied to this input provides an offset for the
V
inputs separate the analog input signal ground from the ADC
ground, allowing cancellation of dc common-mode voltages.
Figure 39 shows the configuration of the AD7328 in pseudo
differential mode.
When a conversion takes place, the pseudo differential ground
corresponds to Code −4096, and the maximum amplitude
corresponds to Code +4095.
Figure 40 and Figure 41 show the typical voltage range on the
V
the pseudo differential mode.
For example, when the AD7328 is configured to operate in
pseudo differential mode and the ±5 V range is selected with
±16.5 V V
V
IN
IN
IN
IN
Figure 38. Common-Mode Range for V
+ input from ground or a pseudo ground. Pseudo differential
+ inputs are coupled to the signal source and must have an
− pin for various analog input ranges when configured in
− pin can vary from −6.5 V to +6.5 V.
–2
–4
–6
–8
8
6
4
2
0
DD
V
V
/V
CC
REF
1
= 5V
SS
ADDITIONAL PINS OMITTED FOR CLARITY.
= 2.5V
Figure 39. Pseudo Differential Inputs
supplies and 5 V V
RANGE
±10V
V+
V–
±16.5V V
±5V RANGE
DD
/V
V
V
RANGE
SS
±2.5V
IN
IN
+
–
AD7328
CC
CC
= 5 V and REFIN/OUT = 2.5 V
RANGE
±12V V
, the voltage on the
±10V
V
V
DD
SS
1
±5V RANGE
DD
V
5V
CC
/V
SS
RANGE
IN
AD7328
±2.5V
− pin. The
IN
− pin.