MAX2140 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Complete SDARS Receiver

19-3123; Rev 1a; 9/04
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Complete SDARS Receiver
General Description
The MAX2140 complete receiver is designed for satellite
digital audio radio services (SDARS). The device
includes a fully monolithic VCO and only needs a SAW at
the IF and a crystal to generate the reference frequency.
To form a complete SDARS radio, the MAX2140
requires only a low-noise amplifier (LNA), which can be
controlled by a baseband controller. The small number
of external components needed makes the MAX2140-
based platform the lowest cost and the smallest solu-
tion for SDARS.
The receiver includes a self-contained RF AGC loop
and baseband-controlled IF AGC loop, effectively pro-
viding a total dynamic range of over 92dB.
Channel selectivity is ensured by the SAW filter and by
on-chip monolithic lowpass filters.
The fractional-N PLL allows a very small frequency
step, making possible the implementation of an AFC
loop. Additionally, the reference is provided by an
external XTAL and on-chip oscillator. A reference buffer
output is also provided.
A 2-wire interface (I²C™ bus compatible) programs the
circuit for a wide variety of conditions, providing fea-
tures such as:
•Programmable gains
•Lowpass filters tuning
•Individual functional block shutdown
The MAX2140 minimizes the requirement on the base-
band controller. No compensation or calibration proce-
dures are required. The device is available in a 7mm ✕
7mm 44-pin thin QFN package.
Applications
Satellite Digital Audio Radio Services (SDARS)
2.4GHz ISM Radios
I²C is a trademark of Philips Corp.
Purchase of I²C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I²C Patent Rights to use these com-
ponents in an I²C system, provided that the system conforms to
the I²C Standard Specification as defined by Philips.
Features
♦ Integrated Receiver, Requires Only One SAW
Filter
♦ Self-Contained RF AGC Loop
♦ Differential I/Q Interface
♦ Complete Integrated Frequency Generation
♦ Bias Supply for External LNAs
♦ Overcurrent Protection
♦ Low-Power Standby Mode
♦ Very Small 44-Pin Thin QFN Package
Ordering Information
PART
TEMP RANGE
MAX2140ETH
-40°C to +85°C
*EP = Exposed paddle.
PIN-PACKAGE
44 Thin QFN-EP*
Block Diagram/Pin Configuration
44 43 42 41 40 39 38 37 36 35 34
VCC_FE0 1
XM TUNER
33 VTUNE
RFIN+ 2
32 VCCREG
RFIN- 3
VCC_FE1 4
IFOUT+ 5
IFOUT- 6
MAX2140
RF
AGC
31 VCC_VCO
30 VCC_FE3
1/N
Σ ∆ - MOD PFD CHP 29 CPOUT
1/R
28 LOCK
RFAGC_C 7
27 VCC_A
VCC_FE2 8
LPF
HPF
26 VCC_D
AGCPWM 9
IFIN+ 10
IFIN- 11
/4/8
QUAD
LPF
HPF
25 REFOUT
24 XTAL
23 VCC_XTAL
12 13 14 15 16 17 18 19 20 21 22
ACTUAL SIZE
7mm x 7mm
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