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AD7741 Datasheet(PDF) 3 Page - Analog Devices

Part No. AD7741
Description  Single and Multichannel, Synchronous Voltage-to-Frequency Converters
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7741 Datasheet(HTML) 3 Page - Analog Devices

 
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REV. 0
–3–
AD7741/AD7742
(VDD = +4.75 V to +5.25 V; VREF = +2.5 V; fCLKIN = 6.144 MHz; all specifications TMIN to
TMAX unless otherwise noted.)
B Version
1
Y Version
2
Parameter
3
Min
Typ
Max
Min
Typ
Max
Units
Conditions/Comments
DC PERFORMANCE
Integral Nonlinearity
fCLKIN = 200 kHz
4
± 0.0122
± 0.015
% of Span
5
fCLKIN = 3 MHz
4
± 0.0122
± 0.015
% of Span
fCLKIN = 6.144 MHz
± 0.0122
± 0.015
% of Span
Offset Error
± 40
± 40
mV
Unipolar Mode
± 40
± 40
mV
Bipolar Mode
Gain Error
+0.2
+1.2
+2.2
+0.2
+1.2
+2.2
% of Span
Unipolar Mode
+0.2
+1.2
+2.2
+0.2
+1.2
+2.2
% of Span
Bipolar Mode
Offset Error Drift
4
± 12
± 12
µV/°C
Unipolar Mode
± 12
± 12
µV/°C
Bipolar Mode
Gain Error Drift
4
± 2
± 2
ppm of Span/
°C
Unipolar Mode
± 4
± 4
ppm of Span/
°C
Bipolar Mode
Power Supply Rejection Ratio
4
–70
–70
dB
∆V
DD = ± 5%
Channel-to-Channel Isolation
4
–75
–75
dB
Common-Mode Rejection
–60
–78
–58
–78
dB
ANALOG INPUTS (VIN1–VIN4)
6
Input Current
± 50
± 100
± 50
± 100
nA
Common-Mode Input Range
+0.5
VDD – 1.75
+0.5
VDD – 1.75
V
Differential Input Range
–VREF/Gain
+VREF/Gain –VREF/Gain
+VREF/Gain
V
Bipolar Mode
0+VREF/Gain 0
+VREF/Gain
V
Unipolar Mode
VOLTAGE REFERENCE
REFIN
Nominal Input Voltage
2.5
2.5
V
Input Impedance
4
fCLKIN = 3 MHz
70
70
k
fCLKIN = 6.144 MHz
35
35
k
REFOUT
Output Voltage
2.38
2.50
2.60
2.38
2.50
2.60
V
Output Impedance
4
11
k
Reference Drift
4
± 50
± 50
ppm/
°C
Line Rejection
–70
–70
dB
Reference Noise
(0.1 Hz to 10 Hz)
4
100
100
µV p-p
LOGIC OUTPUT
Output High Voltage, VOH
4.0
4.0
V
Output Sourcing 800
µA7
Output Low Voltage, VOL
0.4
0.4
V
Output Sinking 1.6 mA
7
Minimum Output Frequency
0.05 fCLKIN
0.05 fCLKIN
Hz
VIN = 0 V (Unipolar), VIN =
–VREF/Gain (Bipolar)
Maximum Output Frequency
0.45 fCLKIN
0.45 fCLKIN
Hz
VIN = VREF/Gain (Unipolar
and Bipolar)
LOGIC INPUT
ALL EXCEPT CLKIN
Input High Voltage, VIH
2.4
2.4
V
Input Low Voltage, VIL
0.8
0.8
V
Input Current
± 100
± 100
nA
Pin Capacitance
6
10
6
10
pF
CLKIN ONLY
Input High Voltage, VIH
3.5
3.5
V
Input Low Voltage, VIL
0.8
0.8
V
Input Current
± 2
± 2
µA
Pin Capacitance
6
10
6
10
pF
CLOCK FREQUENCY
Input Frequency
6.144
6.144
MHz
For Specified Performance
POWER REQUIREMENTS
VDD
4.75
5.25
4.75
5.25
V
IDD (Normal Mode)
6
8
6
8
mA
Output Unloaded
IDD (Power-Down)
25
35
25
35
µA
Power-Up Time
4
30
30
µs
Coming Out of Power-
Down Mode
NOTES
1Temperature range: B Version: –40
°C to +85°C.
2Temperature range: Y Version: –40
°C to +105°C.
3See Terminology.
4Guaranteed by design and characterization, not production tested.
5Span = Maximum Output Frequency–Minimum Output Frequency.
6The absolute voltage on the input pins must not go more positive than V
DD – 1.75 V or more negative than +0.5 V.
7These logic levels apply to CLKOUT only when it is loaded with one CMOS load.
Specifications subject to change without notice
.
AD7742–SPECIFICATIONS


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