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a
AD6140
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., 1998
Bandpass SD IF Subsystem
FUNCTIONAL BLOCK DIAGRAM
MIXER POST
AMPLIFIER
MIXER
D
MODULATOR
AGC
DETECTOR
CIRCUIT
ECL-TO-CMOS
LEVEL-SHIFTER
LNA BIAS
AMPLIFIER
PREAMPLIFIER
IF_INPUT
LNA_SENSE
LNA_FORCE
D_DATA_OUT
D_CLOCK_OUT
BUFFER_VDD
CLK_IN+
CLK_IN–
BUFFER_GND
AVDD AGND DGND DVDD POWER_DOWN
AGC_CAPACITOR
0.1mF
BIAS_RESISTOR
39kV
R
INT
BIAS SYSTEM
AGC_TC_SELECT VOLTAGE_REFERENCE_IN
AD6140
LO_IN+ LO_IN–
FEATURES
IF Subsystem
Bandpass SD Modulator
Variable-Gain Preamplifier with 13 dB of AGC Range
Mixer
AGC Detector
Op Amp for LNA Biasing
ECL-to-CMOS Level Translator
Ultralow Power Design
2.7 V Operating Voltage
4.8 mA Current Consumption
Power-Down Control
Small 20-Lead SSOP Package
APPLICATIONS
FLEX™, ReFLEX™ Receivers
Multimode Receivers
GENERAL DESCRIPTION
The AD6140 is a bandpass SD ADC IF IC for receivers requiring
a high dynamic range and multiple filter bandwidths. With an
external decimation filter, it creates a multibit analog-to-digital
converter. The AD6140 consists of a variable gain, low noise
preamplifier, mixer, AGC detector, bandpass SD modulator, an
ECL-to-CMOS level translator for the system clock, and an
auxiliary amplifier for use in biasing a discrete LNA. It is de-
signed to operate with Motorola’s ReFLEX chipset solution.
Contact Motorola directly for more information about the
ReFLEX chipset solution. With data and clock outputs at CMOS
logic levels, it interfaces to an external decimation filter. It comes in
a 20-lead plastic SSOP and operates over the –40 C to +85 C
industrial temperature range at 2.7 V.
FLEX and ReFLEX are trademarks of Motorola, Inc.