AD7895–SPECIFICATIONS
Parameter
DYNAMIC PERFORMANCE
2
Signal to (Noise + Distortion) Ratio
3
@ +25°C
T
MIN
to T
MAX
Total Harmonic Distortion (THD)
3
Peak Harmonic or Spurious Noise
3
Intermodulation Distortion (IMD)
3
2nd Order Terms
3rd Order Terms
DC ACCURACY
Resolution
Minimum Resolution for which
No Missing Codes are Guaranteed
Relative Accuracy
3
Differential Nonlinearity
3
Positive Full-Scale Error
3
AD7895-2
Unipolar Offset Error
AD7895-10, AD7895-3 Only
Negative Full-Scale Error
3
Bipolar Zero Error
ANALOG INPUT
AD7895-10
Input Voltage Range
Input Resistance
AD7895-3
Input Voltage Range
Input Resistance
AD7895-2
Input Voltage Range
Input Current
REFERENCE INPUT
REF IN Input Voltage Range
Input Current
Input Capacitance
3
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Capacitance, C
IN4
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Output Coding
AD7895-10, AD7895-3
AD7895-2
CONVERSION RATE
Conversion Time
Mode 1 Operation
Mode 2 Operation
5
Track/Hold Acquisition Time
3
POWER REQUIREMENTS
V
DD
I
DD
Power Dissipation
Power-Down Mode
I
DD
@ +25°C
T
MIN
to T
MAX
Power Dissipation @ +25°C
A Versions
l
70
70
–78
–89
–87
–87
12
12
±
1
±
1
±
3
±
3
±
3
±
4
(V
DD
= +5 V, GND = 0 V, REF IN = +2.5 V.
All specifications T
MIN
to T
MAX
unless otherwise noted)
B Versions
Units
Test Conditions/Comments
70
70
–78
–89
–87
–87
12
12
±
1
±
1
±
2
±
2
±
2
±
3
dB min
dB min
dB max
dB typ
dB typ
dB typ
Bits
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
f
IN
= 50 kHz Sine Wave, f
SAMPLE
= 200 kHz
f
IN
= 50 kHz Sine Wave, f
SAMPLE
= 200 kHz,
Typically –87 dB
f
IN
= 50 kHz Sine Wave, f
SAMPLE
= 200 kHz
fa = 9 kHz, fb
=
9.5 kHz, f
SAMPLE
= 200 kHz
Typically 0.4 LSB
±
10
24
±
2.5
9
0 to +2.5
500
2.375/2.625
1
10
2.4
0.8
±
10
10
4.0
0.4
±
10
24
±
2.5
9
0 to +2.5
500
2.375/2.625
1
10
2.4
0.8
±
10
10
4.0
0.4
Volts
kΩ min
Volts
kΩ min
Volts
nA max
V min/V max
µA
max
pF max
V min
V max
µA
max
pF ax
V min
V max
2.5 V
±
5%
V
DD
= 5 V
±
5%
V
DD
= 5 V
±
5%
V
IN
= 0 V to V
DD
I
SOURCE
= 200
µA
I
SINK
= 1.6 mA
2s Complement
Straight (Natural) Binary
3.8
9.8
0.5
+5
4
20
5
10
25
3.8
9.8
0.5
+5
4
20
5
10
25
µs
max
µs
max
µs
max
V nom
mA max
mW max
µA
max
µA
max
µW
max
±
5% for Specified Performance
Digital Inputs @ V
DD
, V
DD
= 5 V
±
5%
Typically 16 mW
Digital Inputs @ GND, V
DD
= 5 V
±
5%
Digital Inputs @ GND, V
DD
= 5 V
±
5%
NOTES
1
Temperature ranges are as follows: A, B Versions: –40°C to +85°C.
2
Applies to Mode 1 operation. See section on “Operating Modes.”
3
See Terminology.
4
Sample tested @ +25°C to ensure compliance.
5
This 9.8
µs
includes the “wake-up” time from standby. This “wake-up” time is timed from the rising edge of
CONVST,
whereas conversion is timed from the falling edge of
CONVST,
for
narrow
CONVST
pulse width the conversion time is effectively the “wake-up” time plus conversion time hence 9.8
µs.
This can be seen from Figure 3. Note that if the
CONVST
pulse width
is greater than 6
µs
then the effective conversion time will increase beyond 9.8
µs.
Specifications subject to change without notice.
–2–
REV. 0
AD [ ANALOG DEVICES ]
