AD6140_15 Datasheet, PDF (1/8 Pages) Analog Devices – Bandpass IF Subsystem

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Bandpass ⌺⌬ IF Subsystem
AD6140
FEATURES
GENERAL DESCRIPTION
IF Subsystem
Bandpass ⌺⌬ Modulator
The AD6140 is a bandpass Σ∆ ADC IF IC for receivers requiring
a high dynamic range and multiple filter bandwidths. With an
Variable-Gain Preamplifier with 13 dB of AGC Range
external decimation filter, it creates a multibit analog-to-digital
Mixer
converter. The AD6140 consists of a variable gain, low noise
AGC Detector
preamplifier, mixer, AGC detector, bandpass Σ∆ modulator, an
Op Amp for LNA Biasing
ECL-to-CMOS level translator for the system clock, and an
OBSOLETE 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
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
FUNCTIONAL BLOCK DIAGRAM
LO_IN+ LO_IN–
PREAMPLIFIER
MIXER POST
AMPLIFIER
AD6140
⌬
MODULATOR
⌬_DATA_OUT
⌬_CLOCK_OUT
MIXER
LNA_SENSE
ECL-TO-CMOS
LNA_FORCE
AGC
LEVEL-SHIFTER
BUFFER_VDD
DETECTOR
LNA BIAS
CIRCUIT
CLK_IN+
AGC_CAPACITOR
AMPLIFIER
CLK_IN–
0.1␮F
BIAS SYSTEM
BUFFER_GND
AGC_TC_SELECT
VOLTAGE_REFERENCE_IN
R_INT
AVDD AGND DGND DVDD POWER_DOWN
BIAS_RESISTOR
39k⍀
FLEX and ReFLEX are trademarks of Motorola, Inc.
REV. 0
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