Datasheet

AD7655
Rev. B | Page 3 of 28
SPECIFICATIONS
AVDD = DVDD = 5 V, OVDD = 2.7 V to 5.25 V; V
REF
= 2.5 V; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Conditions Min Typ Max Unit
RESOLUTION 16 Bits
ANALOG INPUT
Voltage Range V
INx
– V
INxN
0 2 V
REF
V
Common-Mode Input Voltage V
INxN
−0.1 +0.5 V
Analog Input CMRR f
IN
= 100 kHz 55 dB
Input Current 1 MSPS throughput 45 μA
Input Impedance
1
THROUGHPUT SPEED
Complete Cycle (2 Channels) Normal mode 2 μs
Throughput Rate Normal mode 0 1 MSPS
Complete Cycle (2 Channels) Impulse mode 2.25 μs
Throughput Rate Impulse mode 0 888 kSPS
DC ACCURACY
Integral Linearity Error
2
−6 +6 LSB
3
No Missing Codes 15 Bits
Transition Noise 0.8 LSB
Full-Scale Error
4
T
MIN
to T
MAX
±0.25 ±0.5 % of FSR
Full-Scale Error Drift
4
±2 ppm/°C
Unipolar Zero Error
4
T
MIN
to T
MAX
±0.25 % of FSR
Unipolar Zero Error Drift
4
±0.8 ppm/°C
Power Supply Sensitivity AVDD = 5 V ± 5% ±0.8 LSB
AC ACCURACY
Signal-to-Noise f
IN
= 100 kHz 86 dB
5
Spurious-Free Dynamic Range f
IN
= 100 kHz 98 dB
Total Harmonic Distortion f
IN
= 100 kHz −96 dB
Signal-to-Noise and Distortion f
IN
= 100 kHz 86 dB
f
IN
= 100 kHz, −60 dB input 30 dB
Channel-to-Channel Isolation f
IN
= 100 kHz −92 dB
−3 dB Input Bandwidth 10 MHz
SAMPLING DYNAMICS
Aperture Delay 2 ns
Aperture Delay Matching 30 ps
Aperture Jitter 5 ps rms
Transient Response Full-scale step 250 ns
REFERENCE
External Reference Voltage Range 2.3 2.5 AVDD/2 V
External Reference Current Drain 1 MSPS throughput 180 μA
DIGITAL INPUTS
Logic Levels
V
IL
−0.3 +0.8 V
V
IH
+2.0 DVDD + 0.3 V
I
IL
−1 +1 μA
I
IH
−1 +1 μA
DIGITAL OUTPUTS
Data Format
6
Pipeline Delay
7
V
OL
I
SINK
= 1.6 mA 0.4 V
V
OH
I
SOURCE
= −500 μA OVDD − 0.2 V