Datasheet

AD7716–SPECIFICATIONS
1, 2
(f
CLKIN
= 8 MHz; MODE Pin Is High (Slave Mode Operation); AV
DD
= DV
DD
= +5 V
6 5%; AV
SS
= –5 V 6 5%; AGND = DGND = 0 V; V
REF
= 2.5 V; Filter Cutoff = 146 Hz; Noise Measurement Bandwidth = 146 Hz; A
IN
Source
Resistance = 750 V
2
with 1 nF to AGND at each A
IN
. T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Parameter B Version Units Test Conditions/Comments
STATIC PERFORMANCE
Resolution 22 Bits
Integral Linearity Error 0.003 % FSR typ Guaranteed No Missed Codes to 21 Bits
3
0.006 % FSR max
Gain Error 1 % FSR max
Gain Match Between Channels 0.5 % FSR max
Gain TC 30 µV/°C typ
Offset Error 0.2 % FSR max
Offset Match Between Channels 0.1 % FSR max
Offset TC 4 µV/°C typ
Noise 11 µV rms max See Table I for Typical Noise Performance vs. Programmed
Cutoff Frequency
DYNAMIC PERFORMANCE
Sampling Rate f
CLKIN
/14 570 kHz for f
CLKIN
= 8 MHz
Output Update Rate f
CLKIN
/(14 3 256 3 2
N
) N Is Decimal Equivalent of FC2, FC1, FC0 in Control Register
Filter Cutoff Frequency f
CLKIN
/(3.81 3 14 3 256 3 2
N
)
Settling Time (3 3 14 3 256 3 2
N
/f
CLKIN
)
Usable Dynamic Range
4
See Table I
Total Harmonic Distortion –90 dB typ Input Frequency = 35 Hz
–100 dB typ A
IN
= ±10 mV p-p
Absolute Group Delay
3
(3 3 14 3 256 3 2
N
)/2f
CLKIN
Differential Group Delay
3
10 ns typ
Channel-to-Channel Isolation –85 dB typ Feedthrough from Any One Channel to the Other Three, with
35 Hz Full-Scale Sine Wave Applied to that Channel
ANALOG INPUT
Input Range ±2.5 Volts
Input Capacitance 10 pF typ
Input Bias Current 1 nA typ
LOGIC INPUTS
V
INH
, Input High Voltage 2.4 V min
V
INL
, Input Low Voltage 0.8 V max
I
IN
, Input Current
SDATA, RFS +10/-130 µA max Internal 50 kΩ Pull-Up Resistors
TFS +10/-650 µA max Internal 10 kΩ Pull-Up Resistor
All Other Inputs ±10 µA max
C
IN
, Input Capacitance
3
10 pF max
LOGIC OUTPUTS
V
OH
, Output High Voltage 2.4 V min |I
OUT
| ≤ 40 µA
V
OL
, Output Low Voltage 0.4 V max |I
OUT
| ≤ 1.6 mA
POWER SUPPLIES
Reference Input 2.4/2.6 V min/V max
AV
DD
4.75/5.25 V min/V max
DV
DD
4.75/5.25 V min/V max
AV
SS
–4.75/–5.25 V min/V max
I
DD
7.5 mA max 4.8 mA typ
I
SS
2.5 mA max 1.8 mA typ
Power Consumption 50 mW max 35 mW typ
Power Supply Rejection
5
–70 dB typ
NOTES
1
Operating temperature ranges as follows : B Version; –40°C to +85°C.
2
The A
IN
pins present a very high impedance dynamic load which varies with clock frequency.
3
Guaranteed by design and characterization. Digital filter has linear phase.
4
Usable dynamic range is guaranteed by measuring noise and relating this to the full-scale input range.
5
100 mV p-p, 120 Hz sine wave applied to each supply.
Specifications subject to change without notice.
REV. A–2–