AD7740YRMZ Datasheet, PDF (6/11 Pages) Analog Devices – 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter

AD7740–Typical Performance Characteristics
0.015
0.01
0.005
0
BUFFER OFF
VDD = 5V
REFIN = 2.5V
CLKIN = 1MHz
T_A = 25؇C
–0.005
–0.01
BUFFER ON
–0.015
–0.5 0 0.5 1 1.5 2 2.5
VIN – V
TPC 1. INL vs. VIN (Buffered and
Unbuffered)
–4
V_DD = 5V
REFIN = 2.5V
T_A = 25؇C
–5
BUFFER ON
–6
–7
BUFFER OFF
–8 ₀
200 400 600
800 1000
CLKIN FREQUENCY – kHz
TPC 2. Offset Error vs. CLKIN
(Buffered and Unbuffered)
0.1
BUFFER
OFF
0.05
0
BUFFER ON
–0.05
–0.1
0
V_DD = 5V
REFIN = 2.5V
T_A = 25؇C
200 400 600 800
CLKIN FREQUENCY – kHz
1000
TPC 3. Gain Error vs. CLKIN
(Buffered and Unbuffered)
12
REFIN = 2.5V
CLKIN = 1MHz
8 T_A = 25؇C
BUF = 0
4
0.08
–50
GAIN ERROR 0.04
–60
0
BUFFER OFF
BUFFER ON
GAIN ERROR
0
–0.04
OFFSET ERROR
–4
–0.08
–8
–0.12
0
3
4
5
6
VDD – V
TPC 4. Offset and Gain Error vs. VDD
–70
VDD = 5V
REFIN = 4.75V
CLKIN = 1MHz
T_A = 25؇C
–80
–1
0
1
2
3
4
5
VIN – V
TPC 5. PSRR vs. VIN (Buffered and
Unbuffered)
1.25
1 _{BUFFER ON}
0.75
0.5
0.25
0
0
BUFFER OFF
VDD = 5V
REFIN = 5V
T_A = 25؇C
C_FOUT = 43pF
C_CLKOUT = 22pF
200 400 600 800
CLKIN FREQUENCY – kHz
1000
TPC 6. I_DD vs. CLKIN (Buffered and
Unbuffered)
2.520
T_A = 25؇C
2.515
2.510
2.505
FOUT
1
CLKIN
2
VDD = 5V
REFIN = 5V
T_A = 25؇C
CLKIN ؍1 MHz
2.500
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD – V
TPC 7. REFOUT vs. VDD
CH1 2.00V CH2 2.00V M 2.00␮s
TPC 8. Typical FOUT Pulse Train
(VIN = V_REF/4)
–6–
REV. A