AD7708 Analog Devices, AD7708 Datasheet - Page 8

• Manufacturer Part Number: AD7708
• Description: 16-Bit 8/10-Channel, Low Voltage, Low Power, Sigma Delta ADC
• Manufacturer: Analog Devices

Specifications of AD7708

• Resolution (bits): 16bit
• # Chan: 10
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

AD7708
AD7718–SPECIFICATIONS
2.5 V ; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications T
Parameter
LOGIC INPUTS (Continued)
LOGIC OUTPUTS (Excluding XTAL2)
SYSTEM CALIBRATION
START-UP TIME
POWER REQUIREMENTS
NOTES
1
2
3
4
5
Specifications are subject to change without notice.
Temperature range is –40°C to +85°C.
Not production tested, guaranteed by design and/or characterization data at release.
Following a self-calibration this error will be in the order of the noise for the programmed gain and update selected. A system calibration will completely
remove this error.
Recalibration at any temperature will remove these errors.
I/O Port Logic Levels are with respect to AV
SCLK Only (Schmitt-Triggered Input)
XTAL1 Only
Input Currents
Input Capacitance
V
V
V
V
Floating State Leakage Current
Floating State Output Capacitance
Data Output Coding
Full-Scale Calibration Limit
Zero-Scale Calibration Limit
Input Span
From Power-On
From Power-Down Mode
Power Supply Voltages
Power Supply Rejection (PSR)
OH
OL
OH
OL
V
V
V
V
V
V
V
V
V
V
AV
DV
DI
AI
DI
AI
Chop Disabled
Chop Enabled
, Output Low Voltage
, Output Low Voltage
INL
INH
INL
INH
, Output High Voltage
, Output High Voltage
T(+)
T(–)
T(+)
T(+)
T(–)
T(+)
DD
DD
DD
DD
DD
DD
, Input Low Voltage
, Input Low Voltage
, Input High Voltage
, Input High Voltage
–V
–V
(Normal Mode)
(Power-Down Mode)
–AGND
–DGND
(Normal Mode)
(Power-Down Mode)
T(–)
T(–)
2
2
2
2
2
2
DD
5
2
and AGND.
B Grade
1.4/2
0.8/1.4
0.3/0.85
0.95/2
0.4/1.1
0.3/0.85
0.8
3.5
0.4
2.5
± 10
–70
10
DV
0.4
4
0.4
± 10
± 10
Binary
Offset Binary
1.05 × FS
–1.05 × FS
0.8 × FS
2.1 × FS
300
1
300
AV
2.7/3.6
4.75/5.25
2.7/3.6
4.75/5.25
0.55
0.65
1.1
10
2
30
8
1
70
100
DD
DD
1
and DV
– 0.6
(AV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, DV
DD
can be operated independently of each other.
Unit
V min/V max
V min/V max
V min/V max
V min/V max
V min/V max
V min/V max
V max
V min
V max
V min
µA max
µA max
pF typ
V min
V max
V min
V max
µA max
pF typ
V max
V min
V min
V max
ms typ
ms typ
ms typ
V min/max
V min/max
V min/max
V min
mA max
mA
mA
µA max
µA max
µA max
µA max
µA max
dB min
dB typ
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) =
Test Conditions
DV
DV
DV
DV
DV
DV
DV
DV
DV
DV
Logic Input = DV
Logic Input = DGND, Typical –40 µA @ 5 V
and –20 µA at 3 V
All Digital Inputs
DV
DV
DV
DV
Unipolar Mode
Bipolar Mode
Oscillator Powered Down
AV
AV
DV
DV
DV
DV
AV
DV
DV
DV
DV
AV
Input Range = ± 2.56 V, AIN = 1 V
95 dB typ
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
= 3 V nom
= 5 V nom
= 3 V or 5 V, 0.85 mA typ
= 3 V or 5 V
= 5 V
= 5 V
= 5 V
= 3 V
= 3 V
= 3 V
= 5 V
= 5 V
= 3 V
= 3 V
= 3 V, I
= 3 V, I
= 5 V, I
= 5 V, I
= 3 V nom
= 5 V nom
= 3 V, 0.43 mA typ
= 5 V, 0.5 mA typ
= 3 V, 32.768 kHz Osc. Running
= 3 V, Oscillator Powered Down
= 5 V, 32.768 kHz Osc. Running
= 5 V, Oscillator Powered Down
MIN
to T
SOURCE
SINK
SOURCE
SINK
MAX
DD
unless otherwise noted.)
= 100 µA
= 1.6 mA
= 100 µA
= 200 µA