19-1331; Rev 1; 6/98
KIT
ATION
EVALU
BLE
AVAILA
Upstream CATV Driver Amplifier
____________________________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
________________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).
MAX3532
†
_______________Ordering Information
PART
MAX3532EAX
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
36 SSOP
___________________Pin Configuration
TOP VIEW
________________________Applications
Cable Modems
CATV Set-Top Box
Telephony over Cable
GND 1
GND 2
GND 3
GND 4
GND 5
GND 6
36 SHDN
35 TXEN
34 VOUT-
33 VOUT+
32 GND
__________Typical Operating Circuit
36
CONTROL
LOGIC
35
1–10, 12, 13, 15–17,
21–25, 32
TXEN
VOUT+
GND
33
8.0Ω
SHDN
VOUT-
34
8.0Ω
1:2
OUTPUT
MAX3532
31 V
EE
2
30 V
CC
2
29 V
CC
28 VIN+
27 VIN-
26 V
EE
25 GND
24 GND
23 GND
22 GND
21 GND
20 SCLK
19 SDA
GND 7
GND 8
GND 9
GND 10
V
EE
1 11
MAX3532
INPUT
0.001µF
28
27
0.001µF
VIN+
VIN-
V
EE
2
31
0.1µF
GND 12
GND 13
V
CC
V
CC
0.1µF
V
CC
2
V
CC
V
EE
30
29
V
CC
1 14
GND 15
GND 16
GND 17
26
20
19
18
CONTROL
LOGIC
V
CC
0.1µF
14 V 1
CC
11 V 1
EE
SCLK
SDA
CS
CS 18
SSOP
†
P7
________________________________________________________________
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.
Upstream CATV Driver Amplifier
MAX3532
†
ABSOLUTE MAXIMUM RATINGS
V
CC
........................................................................-0.5V to +7.0V
Input Voltage Levels (all inputs) .................-0.3V to (V
CC
+ 0.3V)
Continuous RMS Input Voltage (VIN+, VIN-) ..................60dBmV
Continuous Current (VOUT+, VOUT-)...............................100mA
Continuous Power Dissipation (T
A
= +70°C)
36-Pin SSOP (denote at 11mW/°C above +70°C) ........900mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.25V, no RF applied, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
Supply Voltage
Supply Current
Software Shutdown Current
Shutdown Current
Digital Input High Voltage
Digital Input Low Voltage
Digital Input High Current
Digital Input Low Current
SYMBOL
V
CC
I
CC
I
CC
I
CC
V
IH
V
IL
I
IH
I
IL
TXEN = 1,
SHDN
= 1, D7 and D6 = 1X or 01
TXEN = X,
SHDN
= 1, D7 and D6 = 00
TXEN = X,
SHDN
= 0, D7 and D6 = XX
CS,
SDA, SCLK, TXEN,
SHDN
CS,
SDA, SCLK, TXEN,
SHDN
CS,
SDA, SCLK, TXEN,
SHDN
CS,
SDA, SCLK, TXEN,
SHDN
-100
2.4
0.8
100
CONDITIONS
MIN
4.75
75
1.5
0.1
TYP
MAX
5.25
95
2
10
UNITS
V
mA RMS
mA
µA
V
V
µA
µA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
IN
= 36dBmV,
SHDN
= TXEN = 1, f
IN
= 20MHz, Z
LOAD
= 75Ω through a 1:2 transformer with two precision 8.0Ω back-
termination resistors, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are measured at T
A
= +25°C.)
PARAMETER
Output Signal Swing
Voltage Gain
Output Step Size
Isolation in Standby Mode
Two-Tone Third-Order
Distortion (Note 1)
Second Harmonic Distortion
(Note 1)
Third Harmonic Distortion
(Note 1)
AM to AM
AM to PM
Output Noise
(High-Power Mode) (Note 1)
IMR3
HD2
HD3
AMAM
AMPM
TXEN = 0, f
IN
= 42MHz, V
OUT
= 58dBmV
Two input tones at 40MHz and 40.25MHz, both at
30dBmV; V
OUT
= 52dBmV per tone
f
IN
= 20MHz, V
OUT
= 52dBmV
f
IN
= 20MHz, V
OUT
= 58dBmV
f
IN
= 14MHz, V
OUT
= 52dBmV
f
IN
= 14MHz, V
OUT
= 58dBmV
V
IN
= 36dBmV to 40dBmV, A
V
= 22dB
V
IN
= 36dBmV to 40dBmV, A
V
= 22dB
D7 and D6 = 11, BW = 160kHz,
V
OUT
= 46dBmV to 62dBmV, f = 5MHz to 42MHz
SYMBOL
V
TXOUT
A
V
High power, D7–D0 = 11111101
Low noise, D7–D0 = 1001000
24
CONDITIONS
MIN
TYP
3.6
26
-32
1
36
-43
-59
-46
-67
-57
0.1
1
-80
-79
-37.5
-55
-40
-58
-48
-28
MAX
UNITS
Vp-p
dB
dB
dB
dBc
dBc
dBc
dB
degrees
dBc
2
_______________________________________________________________________________________
Upstream CATV Driver Amplifier
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, V
IN
= 36dBmV,
SHDN
= TXEN = 1, f
IN
= 20MHz, Z
LOAD
= 75Ω through a 1:2 transformer with two precision 8.0Ω back-
termination resistors, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are measured at T
A
= +25°C.)
PARAMETER
Output Noise
(Low-Power Mode)
Output Noise
(Note 1)
(Standby Mode) (Note 1)
Output Noise
(Standby Mode) (Note 1)
Output Return Loss (Note 1)
TXEN Transient Duration
TXEN Transient Step Size
Power-Enable Transient
Duration (Note 1)
SERIAL INTERFACE
CS
to SCLK Setup Time
CS
to SCLK Hold Time
SDA to SCLK Setup Time
SDA to SCLK Hold Time
SCLK Pulse Width High
SCLK Pulse Width Low
t
CSS
t
CSH
t
SDAS
t
SDAH
t
SCLKH
t
SCLKL
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
(Note 1)
20
20
20
20
50
50
ns
ns
ns
ns
ns
ns
SYMBOL
CONDITIONS
D7 and D6 = 10, V
OUT
> 27dBmV,
BW = 160kHz, f = 5MHz to 42MHz
D7 and D6 = 10, V
OUT
≤
27dBmV,
BW = 160kHz, f = 5MHz to 42MHz
TXEN = 0, BW = 160kHz,
f = 5MHz to 42MHz
f
IN
= 5MHz to 42MHz
TXEN rise/fall time < 100ns, T
A
= +25°C (Note 1)
T
A
= +25°C, A
V
= 22dB (Note 1)
T
A
= +25°C
1
12
3
25
2.5
7
100
5
MIN
TYP
-75
-47
-47
MAX
-73
-45
-45
UNITS
dBc
dBmV
dBmV
dB
µs
mV
µs
MAX3532
†
Note 1:
Guaranteed by design and characterization.
__________________________________________Typical Operating Characteristics
(V
CC
= 5.0V, V
IN
= 36dBmV, f
IN
= 20MHz,
SHDN
= TXEN = 1, Z
LOAD
= 75Ω through a 1:2 transformer with two precision 8.0Ω back-
termination resistors, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX3532toc01
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3532toc02
SUPPLY CURRENT vs. OUTPUT LEVEL
95
SUPPLY CURRENT (mA)
90
85
80
75
70
65
60
MAX3532toc03
85
V
CC
= 5.25V
80
SUPPLY CURRENT (mA)
90
85
SUPPLY CURRENT (mA)
80
T
A
= +25°C
75
70
T
A
= -40°C
65
60
T
A
= 0°C
T
A
= +85°C
100
75
70
V
CC
= 5.0V
V
CC
= 4.75V
60
-40
-20
0
25
50
85
TEMPERATURE (°C)
65
4.75
5
SUPPLY VOLTAGE (V)
5.25
12 16 21 26 31 36 41 45 50 55 59 64
OUTPUT LEVEL (dBmV)
_______________________________________________________________________________________
3
Upstream CATV Driver Amplifier
MAX3532
†
_____________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V
IN
= 36dBmV,
SHDN
= TXEN = 1, f
IN
= 20MHz, Z
LOAD
= 75Ω through a 1:2 transformer with two precision 8.0Ω back-
termination resistors, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are measured at T
A
= +25°C.)
GAIN vs. FREQUENCY
MAX3532toc04
OUTPUT NOISE vs. GAIN STATE
MAX3532toc05
OUTPUT LEVEL vs. GAIN STATE
60
OUTPUT LEVEL (dBmV)
50
40
30
20
10
LOW-NOISE MODE
MAX3532toc06
40
30
20
GAIN (dB)
10
0
-10
-20
-30
-40
0
20
40
60
80
100 120 140
FREQUENCY (MHz)
54
48
60
54
48
42
36
30
24
18
HIGH-POWER MODE
LOW-NOISE MODE
57
GAIN STATE 60
-10
OUTPUT NOISE IN 160kHz (dBmV)
-15
-20
-25
-30
-35
-40
-45
-50
LOW-NOISE MODE
HIGH-POWER MODE
70
HIGH-POWER MODE
0
-10
0
5 10 15 20 25 30 35 40 45 50 55 60
GAIN STATE
5 10 15 20 25 30 35 40 45 50 55 60
GAIN STATE
REAL AND IMAGINARY INPUT
IMPEDANCE vs. FREQUENCY
10,000
8000
IMPEDANCE (Ω)
IMPEDANCE (Ω)
6000
4000
2000
0
-2000
-4000
-6000
0
20
40
60
80
100
FREQUENCY (MHz)
0
5
IMAGINARY
REAL
80
60
40
20
MAX3532toc07
REAL AND IMAGINARY OUTPUT
IMPEDANCE vs. FREQUENCY
MAX3532toc08
12,000
120
100
REAL
IMAGINARY
10
20
30
40
50
75
100
FREQUENCY (MHz)
SECOND HARMONIC DISTORTION vs.
INPUT FREQUENCY
MAX3532toc09
THIRD HARMONIC DISTORTION vs.
INPUT FREQUENCY
-35
HARMONIC DISTORTION (dBc)
-40
-45
-50
-55
-60
-65
-70
V
OUT
= 40dBmV
V
OUT
= 25dBmV
V
OUT
= 55dBmV
V
OUT
= 52dBmV
MAX3532toc10
-30
-35
HARMONIC DISTORTION (dBc)
-40
-45
-50
-55
-60
-65
-70
10
15
20
V
OUT
= 40dBmV
25
30
35
40
45
V
OUT
= 25dBmV
V
OUT
= 55dBmV
-30
-75
50
10
15
20
25
30
35
40
45
50
INPUT FREQUENCY (MHz)
INPUT FREQUENCY (MHz)
4
_______________________________________________________________________________________
Upstream CATV Driver Amplifier
______________________________________________________________Pin Description
PIN
1–10, 12, 13,
15, 16, 17,
21–25, 32
11
14
18
19
20
26
NAME
GND
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.
FUNCTION
MAX3532
†
V
EE
1
V
CC
1
CS
SDA
SCLK
V
EE
27
VIN-
28
29
30
31
33
34
VIN+
V
CC
V
CC
2
V
EE
2
VOUT+
VOUT-
35
TXEN
36
SHDN
_______________________________________________________________________________________
5
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