AD6140 Datasheet, PDF (1/8 Pages) Analog Devices – Bandpass IF Subsystem

a
FEATURES
IF Subsystem
Bandpass ⌺⌬ 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
Bandpass ⌺⌬ IF Subsystem
AD6140
GENERAL DESCRIPTION
The AD6140 is a bandpass Σ∆ 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 Σ∆ 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.
IF_INPUT
LNA_SENSE
LNA_FORCE
AGC_CAPACITOR
0.1␮F
AGC_TC_SELECT
FUNCTIONAL BLOCK DIAGRAM
LO_IN+ LO_IN–
PREAMPLIFIER
MIXER POST
AMPLIFIER
LNA BIAS
AMPLIFIER
MIXER
AGC
DETECTOR
CIRCUIT
AD6140
⌬
MODULATOR
ECL-TO-CMOS
LEVEL-SHIFTER
BIAS SYSTEM
⌬_DATA_OUT
⌬_CLOCK_OUT
BUFFER_VDD
CLK_IN+
CLK_IN–
BUFFER_GND
VOLTAGE_REFERENCE_IN
R_INT
AVDD AGND DGND DVDD POWER_DOWN
BIAS_RESISTOR
39k⍀
FLEX and ReFLEX are trademarks of Motorola, Inc.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone]
© Analog Devices, Inc., 1998