SA602A
Double-balanced mixer and oscillator
Rev. 3 — 27 May 2014
Product data sheet
1. General description
The SA602A is a low-power VHF monolithic double-balanced mixer with input amplifier,
on-board oscillator, and voltage regulator. It is intended for high-performance, low-power
communication systems. The guaranteed parameters of the SA602A make this device
well-suited for cellular radio applications. The mixer is a ‘Gilbert cell’ multiplier
configuration which typically provides 18 dB of gain at 45 MHz. The oscillator operates to
200 MHz. It can be configured as a crystal oscillator, a tuned tank oscillator, or a buffer for
an external LO. For higher frequencies, the LO input may be externally driven. The noise
figure at 45 MHz is typically less than 5 dB. The gain, intercept performance, low-power
and noise characteristics make the SA602A a superior choice for high-performance
battery operated equipment. It is available in an 8-lead SO (surface-mount miniature
package).
2. Features and benefits
Low current consumption: 2.4 mA typical
Excellent noise figure: <4.7 dB typical at 45 MHz
High operating frequency
Excellent gain, intercept and sensitivity
Low external parts count; suitable for crystal/ceramic filters
SA602A meets cellular radio specifications
3. Applications
Cellular radio mixer/oscillator
Portable radio
VHF transceivers
RF data links
HF/VHF frequency conversion
Instrumentation frequency conversion
Broadband LANs
NXP Semiconductors
SA602A
Double-balanced mixer and oscillator
4. Ordering information
Table 1.
Ordering information
Package
Name
SA602AD/01
SO8
Description
plastic small outline package; 8 leads; body width 3.9 mm
Version
SOT96-1
Type number
4.1 Ordering options
Table 2.
Ordering options
Orderable
part number
SA602AD/01,112
SA602AD/01,118
Package
Packing method
Minimum
order
quantity
Temperature
Type number
SA602AD/01
SO8
SO8
Standard marking
2000
* IC’s tube - DSC bulk pack
Reel 13” Q1/T1
Standard mark SMD
2500
T
amb
=
40 C
to +85
C
T
amb
=
40 C
to +85
C
5. Block diagram
OSC_E
OSC_B
OUT_B
5
4
OUT_A
aaa-013202
V
CC
8
7
E
6
B
VOLTAGE
REGULATOR
OSCILLATOR
1
IN_A
2
IN_B
3
GND
Fig 1.
Block diagram
SA602A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 3 — 27 May 2014
2 of 19
NXP Semiconductors
SA602A
Double-balanced mixer and oscillator
6. Pinning information
6.1 Pinning
SA602AD/01
IN_A
IN_B
GND
OUT_A
1
2
3
4
aaa-013201
8
7
6
5
V
CC
OSC_E
OSC_B
OUT_B
Fig 2.
Pin configuration for SO8
6.2 Pin description
Table 3.
Symbol
IN_A
IN_B
GND
OUT_A
OUT_B
OSC_B
OSC_E
V
CC
Pin description
Pin
1
2
3
4
5
6
7
8
Description
RF input A
RF input B
ground
mixer output A
mixer output B
oscillator input (base)
oscillator output (emitter)
supply voltage
SA602A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 3 — 27 May 2014
3 of 19
NXP Semiconductors
SA602A
Double-balanced mixer and oscillator
7. Functional description
The SA602A is a Gilbert cell, an oscillator/buffer, and a temperature-compensated bias
network as shown in
Figure 3.
The Gilbert cell is a differential amplifier (IN_A and IN_B
pins) that drives a balanced switching cell. The differential input stage provides gain and
determines the noise figure and signal handling performance of the system.
18 kΩ
buffer
1.5 kΩ
1.5 kΩ
6
7
25 kΩ
4
5
BIAS
BIAS
2
1
BIAS
1.5 kΩ
1.5 kΩ
3
GND
aaa-013205
Fig 3.
Equivalent circuit
The SA602A is designed for optimum low-power performance. When used with the
SA604A as a 45 MHz cellular radio second IF and demodulator, the SA602A is capable of
receiving
119
dBm signals with a 12 dB S/N ratio. Third-order intercept is typically
13
dBm (that is approximately +5 dBm output intercept because of the RF gain). The
system designer must be cognizant of this large signal limitation. When designing LANs or
other closed systems where transmission levels are high, and small-signal or
signal-to-noise issues are not critical, the input to the SA602A should be appropriately
scaled.
Besides excellent low-power performance well into VHF, the SA602A is designed to be
flexible. The input, RF mixer output and oscillator ports support various configurations
provided the designer understands certain constraints, which are explained here.
The RF inputs (IN_A and IN_B pins) are biased internally. They are symmetrical. The
equivalent AC input impedance is approximately 1.5 k
3 pF through 50 MHz. IN_A and
IN_B pins can be used interchangeably, but they should not be DC biased externally.
Figure 4
shows three typical input configurations.
SA602A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 3 — 27 May 2014
4 of 19
NXP Semiconductors
SA602A
Double-balanced mixer and oscillator
SA602A
SA602A
SA602A
1
2
1
2
1
aaa-013217
input
aaa-013216
2
aaa-013218
aaa-013220
a. Single-ended
tuned input
b. Balanced input
(for attenuation of
second-order
products)
c. Single-ended
untuned input
Fig 4.
Input configuration
The mixer outputs (OUT_A and OUT_B pins) are also internally biased. Each output is
connected to the internal positive supply by a 1.5 k resistor. This permits direct output
termination yet allows for balanced output as well.
Figure 5
shows three single-ended
output configurations and a balanced output.
5
SA602A
SA602A
4
aaa-013219
a. Single-ended ceramic filter
b. Single-ended crystal filter
4
5
5
SA602A
SA602A
4
4
5
aaa-013221
aaa-013222
c. Single-ended IFT
Fig 5.
Output configuration
d. Balanced output
SA602A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 3 — 27 May 2014
5 of 19
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