Datasheet

–6–
–0.015
–0.005
0
0.005
0.01
–0.01
–0.5 0 0.5
1.51
2
2.5
VIN – V
VDD = 5V
REFIN = 2.5V
CLKIN = 1MHz
T
A
= 25C
BUFFER OFF
BUFFER ON
INL ERROR – % of Span
0.015
TPC 1. INL vs. VIN (Buffered and
Unbuffered)
VDD – V
OFFSET ERROR – mV
12
8
–8
03 6
45
4
–4
0
REFIN = 2.5V
CLKIN = 1MHz
T
A
= 25C
BUF = 0
GAIN ERROR
GAIN ERROR
OFFSET ERROR
0.08
0.04
–0.12
0
–0.08
–0.04
GAIN ERROR – % Span
TPC 4. Offset and Gain Error vs. VDD
VDD – V
REFOUT – V
2.520
2.500
2.5 3.0 5.5
3.5
2.515
2.510
T
A
= 25C
2.505
4.0
4.5
5.0
TPC 7. REFOUT vs. VDD
CLKIN FREQUENCY – kHz
OFFSET ERROR – mV
–4
–5
–8
0 200 1000
400
–6
–7
600 800
V
DD
= 5V
REFIN = 2.5V
T
A
= 25C
BUFFER ON
BUFFER OFF
TPC 2. Offset Error vs. CLKIN
(Buffered and Unbuffered)
VIN – V
–80
–1
0
5
1
23
4
PSRR – dB
–60
–50
–70
VDD = 5V
REFIN = 4.75V
CLKIN = 1MHz
T
A
= 25C
BUFFER ON
BUFFER OFF
TPC 5. PSRR vs. VIN (Buffered and
Unbuffered)
2.00V CH2 2.00V M 2.00

s
FOUT
CLKIN
2
VDD = 5V
REFIN = 5V
T
A
= 25C
CLKIN  1 MHz
1
CH1
TPC 8. Typical FOUT Pulse Train
(VIN = V
REF
/4)
CLKIN FREQUENCY – kHz
–0.1
0
–0.05
0.05
0.1
0 200 800600400 1000
GAIN ERROR – % Span
BUFFER
OFF
BUFFER ON
V
DD
= 5V
REFIN = 2.5V
T
A
= 25C
TPC 3. Gain Error vs. CLKIN
(Buffered and Unbuffered)
CLKIN FREQUENCY – kHz
I
DD
– mA
0
0
200
0.25
400 600 800
1000
0.5
0.75
1
1.25
BUFFER OFF
BUFFER ON
VDD = 5V
REFIN = 5V
T
A
= 25C
C
FOUT
= 43pF
C
CLKOUT
= 22pF
TPC 6. I
DD
vs. CLKIN (Buffered and
Unbuffered)
AD7740–Typical Performance Characteristics
REV. A