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FEATURES
AD7741: One Single-Ended Input Channel
Single and Multichannel, Synchronous
Voltage-to-Frequency Converters
AD7741/AD7742
FUNCTIONAL BLOCK DIAGRAMS
AD7742: Two Differential or Three Pseudo-Differential
V DD
REFIN/OUT
PD
Input Channels
Integral Nonlinearity of 0.012% at f OUT (Max) = 2.75 MHz
(AD7742) and at f OUT (Max) = 1.35 MHz (AD7741)
+2.5V
REFERENCE
POWER-DOWN
LOGIC
Single +5 V Supply Operation
Buffered Inputs
Programmable Gain Analog Front-End
V IN
X1
VOLTAGE-TO-
FREQUENCY
MODULATOR
f OUT
On-Chip +2.5 V Reference
Internal/External Reference Option
Power Down to 35 A Max
Minimal External Components Required
8-Lead and 16-Lead DIP and SOIC Packages
CLOCK
GENERATION
AD7741
APPLICATIONS
CLKIN
CLKOUT
GND
Low Cost Analog-to-Digital Conversion
Signal Isolation
GAIN
V IN 1
V DD
UNI/ BIP
AD7742
PD
POWER-DOWN
LOGIC
V IN 2
V IN 3
INPUT
MUX
X1/X2
VOLTAGE-TO-
FREQUENCY
MODULATOR
f OUT
GENERAL DESCRIPTION
The AD7741/AD7742 are a new generation of synchronous
voltage-to-frequency converters (VFCs). The AD7741 is a
V IN 4
A1
A0
CLOCK
GENERATION
+2.5V
REFERENCE
single-channel version in an 8-lead package (SOIC/DIP) and the
AD7742 is a multichannel version in a 16-lead package (SOIC/
GND
CLKIN
CLKOUT
REFIN
REFOUT
DIP). No user trimming is required to achieve the specified
performance.
The AD7741 has a single buffered input whereas the AD7742
has four buffered inputs that may be configured as two fully-
differential inputs or three pseudo-differential inputs. Both parts
include an on-chip +2.5 V bandgap reference that provides the
user with the option of using this internal reference or an exter-
nal reference.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
The AD7741 has a single-ended voltage input range from 0 V
to REFIN. The AD7742 has a differential voltage input range
from –V REF to +V REF . Both parts operate from a single +5 V
supply consuming typically 6 mA, and also contain a power-
down feature that reduces the current consumption to less than
35 μ A.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 ? Analog Devices, Inc., 1999
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