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19-3123; Rev 3; 10/05
ATION
EVALU
AVAIL
KIT
ABLE
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
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
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.
PART
MAX2140ETH
MAX2140ETH+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
44 Thin QFN-EP*
44 Thin QFN-EP*
A 2-wire interface (I 2 C-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
* EP = Exposed paddle.
+ Denotes lead-free package.
Block Diagram/Pin Configuration
The MAX2140 minimizes the requirement on the base-
44
43
42
41
40
39
38
37
36
35
34
band controller. No compensation or calibration proce-
dures are required. The device is available in a 7mm ?
7mm 44-pin thin QFN package.
VCC_FE0 1
RFIN+ 2
RFIN- 3
XM TUNER
MAX2140
33 VTUNE
32 VCCREG
31 VCC_VCO
Applications
VCC_FE1 4
RF
1/N
30 VCC_FE3
Satellite Digital Audio Radio Services (SDARS)
2.4GHz ISM Radios
IFOUT+ 5
IFOUT- 6
AGC
Σ Δ - MOD
PFD
1/R
CHP
29 CPOUT
28 LOCK
RFAGC_C 7
27 VCC_A
VCC_FE2 8
AGCPWM 9
/4/8
LPF
HPF
26 VCC_D
25 REFOUT
QUAD
IFIN+ 10
IFIN- 11
LPF
HPF
24 XTAL
23 VCC_XTAL
12
13
14
15
16
17
18
19
20
21
22
ACTUAL SIZE
7mm x 7mm
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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