MAX3532EAX Datasheet PDF - Maxim Integrated
| Part Number | MAX3532EAX | |
| Description | Upstream CATV Driver Amplifier | |
| Manufacturers | Maxim Integrated | |
| Logo |  |
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19-1331; Rev 1; 6/98
EVAALVUAAILTAIOBNLEKIT
Upstream CATV Driver Amplifier
________________General Description
The MAX3532 is a programmable power amplifier for
use in upstream cable applications. The device outputs
up to 62dBmV (continuous wave) through a 1:2 (voltage
ratio) transformer when driven with 36dBmV at its input.
It features variable gain, which is controlled via a 3-wire
digital serial bus and available in 1dB steps. The operat-
ing frequency ranges from 5MHz to 42MHz.
The MAX3532 offers three operating modes: high power,
low noise, and transmit disable. High-power mode
achieves the highest output levels, while low-noise mode
achieves the lowest output noise when driving lower out-
put levels. Transmit disable mode places the device in a
high-isolation state with minimum output noise, for use
between bursts in TDMA systems.
Two power-down modes are also available. Software shut-
down mode permits power-down of all analog circuitry while
maintaining the programmed gain setting. Shutdown mode
disables all circuitry and reduces current consumption
below 10µA.
The MAX3532 comes in a 36-pin SSOP package screened
for the extended-industrial temperature range (-40°C to
+85°C).
________________________Applications
Cable Modems
CATV Set-Top Box
Telephony over Cable
__________Typical Operating Circuit
36
SHDN
CONTROL
LOGIC
35
1–10, 12, 13, 15–17,
21–25, 32
TXEN
GND
VOUT- 34 8.0Ω 1:2 OUTPUT
VOUT+ 33 8.0Ω
MAX3532 VEE2 31
INPUT
0.001µF
28
27
VIN+
VIN-
0.001µF
VCC
0.1µF
14 VCC1
11 VEE1
VCC2
VCC
30
29
VEE
SCLK
SDA
CS
26
20
19
18
0.1µF
0.1µF
VCC
VCC
CONTROL
LOGIC
____________________________Features
o Single +5V Supply
o Output Level Ranges from Less than 8dBmV
to 62dBmV, in 1dB Steps
o Gain Programmable in 1dB Steps
o 350mW Typical Power Dissipation
o Transmit-Disable Mode
o Two Shutdown Modes
_______________Ordering Information
PART
MAX3532EAX
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
36 SSOP
___________________Pin Configuration
TOP VIEW
GND 1
GND 2
GND 3
GND 4
GND 5
GND 6
GND 7
GND 8
GND 9
GND 10
VEE1 11
GND 12
GND 13
VCC1 14
GND 15
GND 16
GND 17
CS 18
MAX3532
SSOP
36 SHDN
35 TXEN
34 VOUT-
33 VOUT+
32 GND
31 VEE2
30 VCC2
29 VCC
28 VIN+
27 VIN-
26 VEE
25 GND
24 GND
23 GND
22 GND
21 GND
20 SCLK
19 SDA
†Protected under U.S. Patent 5,748,027
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
|
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Upstream CATV Driver Amplifier
______________________________________________________________Pin Description
PIN
1–10, 12, 13,
15, 16, 17,
21–25, 32
11
14
18
19
20
26
27
28
29
30
31
33
34
35
36
NAME
GND
VEE1
VCC1
CS
SDA
SCLK
VEE
VIN-
VIN+
VCC
VCC2
VEE2
VOUT+
VOUT-
TXEN
SHDN
FUNCTION
Ground Pins
Serial Data Interface Ground. As with all grounds, maintain the shortest possible
(low-inductance) connections to the ground plane.
Serial Data Interface +5V Supply. Bypass this pin with a 0.1µF decoupling capacitor as close to the
part as possible.
Serial-Interface Enable. TTL-compatible input. See Serial Interface section.
Serial-Interface Data. TTL-compatible input. See Serial Interface section.
Serial-Interface Clock. TTL-compatible input. See Serial Interface section.
Programmable Gain Amplifier (PGA) Ground. As with all grounds, maintain the shortest possible
(low-inductance) connection to the ground plane.
Negative Input. When not used, this port must be AC coupled to ground. Along with VIN+, this port
forms a high-impedance differential input to the PGA. Driving this port differentially will increase the
rejection of second-order distortion.
Positive Input. Along with VIN-, this port forms a high-impedance differential input to the PGA. Driving
this port differentially will increase the rejection of second-order distortion. AC couple to this pin.
PGA +5V Supply. Bypass this pin with a decoupling capacitor as close to the part as possible.
Power Amplifier +5V Supply. Bypass this pin with a decoupling capacitor as close to the part as
possible.
Power Amplifier Ground. As with all grounds, connections maintain the shortest possible (low-induc-
tance) length to the ground plane.
Positive Output. Along with VOUT-, this pin forms a low-impedance output. Typically this port drives
a 1:2 transformer through 8Ω series resistors.
Negative Output. Along with VOUT+, this pin forms a low-impedance output. Typically this port
drives a 1:2 transformer through 8Ω series resistors.
Transmit Amplifier Enable. Setting this pin low places the transmitter in a high-isolation state (transmit
disable mode). In this mode, however, significant common-mode voltage swings exist. It is, there-
fore, important to maintain good balance of the differential output through to the transformer primary.
Shutdown. When this pin is set low, all functions (including the serial interface) are disabled, leaving
only leakage currents to flow.
_______________________________________________________________________________________ 5
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