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Analog Devices Semiconductor Electronic Components Datasheet

AD6140 Datasheet

Bandpass IF Subsystem

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AD6140 pdf
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
0.1F
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
RINT
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: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998


Analog Devices Semiconductor Electronic Components Datasheet

AD6140 Datasheet

Bandpass IF Subsystem

No Preview Available !

AD6140 pdf
AD6140–SPECIFICATIONS (TA = +25؇C, VCC = 2.7 V, VOLTAGE_REFERENCE_IN = 1 V, unless otherwise noted)
Specification
Conditions
Min Typ Max
Units
OVERALL
Input Third Order Intercept Point
Noise Figure
Input Resistance
Input Capacitance
Dynamic Range
Maximum Gain
Minimum Gain
VOLTAGE_REFERENCE_IN = 1 V ± 5% dc,
IF = 49.6 MHz
LO = 49.792 MHz or 49.408 MHz, 200 mV p-p
Differential Input
Clock = 6.144 MHz, 800 mV p-p Differential ECL
Input, Clock Asymmetry = 50 ± 2.5%
At Max Gain
At Max Gain, External Termination
At IF_INPUT (Pin 19)
At IF_INPUT (Pin 19)
6.25 kHz Bandwidth Centered at 192 kHz
–27
76
–19
10.5
2.5
12
83
29.5
16
dBm
dB
k
pF
dB
dB
dB
AGC DETECTOR
AGC Threshold
Capacitor Charging Current
AGC_TC_SELECT Input = Logic LOW (FAST AGC)
AGC_TC_SELECT Input = Logic HIGH (SLOW AGC)
–24
2.8
50
dBm
µA
nA
ECL-TO-CMOS LEVEL
TRANSLATOR
Clock Output Drive
Clock Asymmetry
VDD (to VDD – 0.8 V) Differential Levels
5 pF Load
5 pF Load
2.6
± 2.5
V p-p
%
LNA BIAS AMPLIFIER VOLTAGE
LNA_FORCE
2.9 V LNA_SENSE, Minimum Gain
LNA_SENSE Input Voltage Range
1.7
VDD
V
VDD – 0.3 V
POWER-DOWN INTERFACE
Logic Threshold
Turn-On Response Time
Turn-Off Response Time
To Valid Data Output
To Typical Power-Down Supply Current
0.7 V
100 µs
100 µs
POWER SUPPLY
Supply Voltage
Supply Current
Power-Down Current
Operating Temperature Range
Power-Down Input: Logic LOW = ON, IF_Input = 0 V
Power-Down Input: Logic HIGH = OFF
2.5
–40
2.9
4.8 5.75
3
+85
V
mA
µA
°C
Specifications subject to change without notice.
–2– REV. 0


Part Number AD6140
Description Bandpass IF Subsystem
Maker Analog Devices
Total Page 8 Pages
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