Rainbow Electronics MAX2055 - Manual

General Description
The MAX2055 high-performance, digitally controlled,
variable-gain, differential analog-to-digital converter
(ADC) driver/amplifier (DVGA) is designed for use from
30MHz to 300MHz in base station receivers.
The device integrates a digitally controlled attenuator
and a high-linearity single-ended-to-differential output
amplifier, which can either eliminate an external trans-
former, or can improve the even-order distortion perfor-
mance of a transformer-coupled circuit, thus relaxing
the requirements of the anti-alias filter preceding an
ADC. Targeted for ADC driver applications to adjust
gain either dynamically or as a one-time channel gain
setting, the MAX2055 is ideal for applications requiring
high performance. The attenuator provides 23dB of
attenuation range with ±0.2dB accuracy.
The MAX2055 is available in a thermally enhanced 20-
pin TSSOP-EP package and operates over the -40°C to
+85°C temperature range.
Applications
Cellular Base Stations
PHS/PAS Infrastructure
Receiver Gain Control
Broadband Systems
Automatic Test Equipment
Terrestrial Links
High-Performance ADC Drivers
Features
♦ 30MHz to 300MHz Frequency Range
♦ Single-Ended-to-Differential Conversion
♦ -3dB to +20dB Variable Gain
♦ 40dBm Output IP3 (at All Gain States and 70MHz)
♦ 2nd Harmonic -76dBc
♦ 3rd Harmonic -69dBc
♦ Noise Figure: 5.8dB at Maximum Gain
♦ Digitally Controlled Gain with 1dB Resolution and
±0.2dB Accuracy
♦ Adjustable Bias Current
MAX2055
Digitally Controlled, Variable-Gain, Differential
ADC Driver/Amplifier
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
GND
ATTN
OUT
GND
I SET B4
GND
RF_IN
V CC
C C
AMP
IN
L E
C BP
B0
B1
B2
B3
12
11
9
10
I BIAS
RF_OUT+ RF_OUT-
ATTENUATION
LOGIC
CONTROL
V
CC
TSSOP
MAX2055
TOP VIEW
19-2799; Rev 0; 4/03
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.
PART TEMP RANGE PIN-PACKAGE
MAX2055EUP-T -40 °C to +85°C 20 TSSOP-EP*
*EP = Exposed paddle.
Pin Configuration/
Functional Diagram