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AD7741BR Arkusz danych(PDF) 6 Page - Analog Devices

Numer części AD7741BR
Szczegółowy opis  Single and Multichannel, Synchronous Voltage-to-Frequency Converters
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AD7741BR Arkusz danych(HTML) 6 Page - Analog Devices

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AD7742 PIN FUNCTION DESCRIPTION
Pin No.
Mnemonic
Function
1fOUT
Frequency Output. This pin provides the output of the synchronous VFC.
2VDD
Power Supply Input. These parts can be operated from +4.75 V to +5.25 V and the supply should be
adequately decoupled to GND.
3
GND
Ground reference point for all circuitry on the part.
4–5
A1, A0
Address Inputs used to select the input channel configuration.
6
CLKOUT
External Clock Output. When the master clock for the device is a crystal, the crystal is connected be-
tween CLKIN and CLKOUT. When an external clock is applied to CLKIN, the CLKOUT pin
provides an inverted clock signal. This clock should be buffered if it is to be used as a clock source
elsewhere in the system.
7
CLKIN
External Clock Input. The master clock for the device can be provided in the form of a crystal or an
external clock. A crystal may be tied across the CLKIN and CLKOUT pins. Alternatively, the CLKIN
pin may be driven by a CMOS-compatible clock and CLKOUT left unconnected. The frequency of the
master clock may be as high as 6 MHz.
8
UNI/
BIP
Control input which determines whether the device operates with differential bipolar analog input
signals or differential unipolar analog input signals.
9
REFOUT
2.5 V Voltage Reference Output. This can be tied directly to REFIN. It may also be used as a reference
to other parts of the system provided it is buffered first.
10
REFIN
This is the Reference Input to the core of the VFC and defines the span of the VFC. A 2.5 V reference
is required at this pin. This may be provided by connecting it directly to REFOUT or by using a preci-
sion external reference (e.g., REF192).
11
VIN1
Buffered Analog Input Channel 1. This is either a pseudo-differential input with respect to VIN4 or it is
the positive input of a truly-differential input pair with respect to VIN2.
12
VIN2
Buffered Analog Input Channel 2. This is either a pseudo-differential input with respect to VIN4 or it is
the negative input of a truly-differential input pair with respect to VIN1.
13
VIN3
Buffered Analog Input Channel 3. This is the positive input of a truly-differential input pair with re-
spect to VIN4.
14
VIN4
Buffered Analog Input Channel 4. This is either the common for pseudo-differential input with respect
to VIN1 or VIN2 or it is the negative input of a truly-differential input pair with respect to VIN3.
15
GAIN
Gain Select input that controls whether the gain on the analog front-end is X1 or X2.
16
PD
Active Low Power-Down pin. When this input is low, the part enters power-down mode where it typi-
cally consumes 25
µA of current.
PIN CONFIGURATION
TOP VIEW
(Not to Scale)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
fOUT
PD
AD7742
VDD
GAIN
GND
VIN4
A1
VIN3
A0
VIN2
CLKOUT
VIN1
CLKIN
REFIN
UNI/
BIP
REFOUT


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