Datasheet

AD7441/AD7451
Rev. D | Page 3 of 24
SPECIFICATIONS
V
DD
= 2.7 V to 5.25 V; f
SCLK
= 18 MHz; f
S
= 1 MSPS; V
REF
= 2.5 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Temperature ranges for A, B
versions: −40°C to +85°C.
Table 1. AD7451
Parameter Test Conditions/Comments A Version B Version Unit
DYNAMIC PERFORMANCE f
IN
= 100 kHz
Signal-to-Noise Ratio (SNR)
1
V
DD
= 2.7 V to 5.25 V 70 70 dB min
Signal-to-(Noise + Distortion) (SINAD)
1
V
DD
= 2.7 V to 3.6 V 69 69 dB min
V
DD
= 4.75 V to 5.25 V 70 70 dB min
Total Harmonic Distortion (THD)
1
V
DD
= 2.7 V to 3.6 V; −78 dB typ −73 −73 dB max
V
DD
= 4.75 V to 5.25 V; −80 dB typ −75 −75 dB max
Peak Harmonic or Spurious Noise
1
V
DD
= 2.7 V to 3.6 V; −80 dB typ −73 −73 dB max
V
DD
= 4.75 V to 5.25 V; −82 dB typ −75 −75 dB max
Intermodulation Distortion (IMD)
1
fa = 90 kHz; fb = 110 kHz
Second-Order Terms −80 −80 dB typ
Third-Order Terms −80 −80 dB typ
Aperture Delay
1
5 5 ns typ
Aperture Jitter
1
50 50 ps typ
Full-Power Bandwidth
1, 2
@ −3 dB 20 20 MHz typ
@ −0.1 dB 2.5 2.5 MHz typ
DC ACCURACY
Resolution 12 12 Bits
Integral Nonlinearity (INL)
1
±1.5 ±1 LSB max
Differential Nonlinearity (DNL)
1
Guaranteed no missed codes to 12 bits ±0.95 ±0.95 LSB max
Offset Error
1
±3.5 ±3.5 LSB max
Gain Error
1
±3 ±3 LSB max
ANALOG INPUT
Full-Scale Input Span V
IN+
− V
IN–
V
REF
V
REF
V
Absolute Input Voltage
V
IN+
V
REF
V
REF
V
V
IN–
3
V
DD
= 2.7 V to 3.6 V −0.1 to +0.4 −0.1 to +0.4 V
V
DD
= 4.75 V to 5.25 V −0.1 to +1.5 −0.1 to +1.5 V
DC Leakage Current ±1 ±1 μA max
Input Capacitance When in track-and-hold 30/10 30/10 pF typ
REFERENCE INPUT
V
REF
Input Voltage
4
±1% tolerance for specified performance 2.5 2.5 V
DC Leakage Current ±1 ±1 μA max
V
REF
Input Capacitance When in track-and-hold 10/30 10/30 pF typ
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 V min
Input Low Voltage, V
INL
0.8 0.8 V max
Input Current, I
IN
Typically 10 nA, V
IN
= 0 V or V
DD
±1 ±1 μA max
Input Capacitance, C
IN
5
10 10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DD
= 4.75 V to 5.25 V; I
SOURCE
= 200 μA 2.8 2.8 V min
V
DD
= 2.7 V to 3.6 V; I
SOURCE
= 200 μA 2.4 2.4 V min
Output Low Voltage, V
OL
I
SINK
= 200 μA 0.4 0.4 V max
Floating-State Leakage Current ±1 ±1 μA max
Floating-State Output Capacitance
5
10 10 pF max
Output Coding
Straight
(natural) binary
Straight
(natural) binary