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PDF SA614A Data sheet ( Hoja de datos )
| Número de pieza | SA614A | |
| Descripción | Low power FM IF system | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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SA614A
Low power FM IF system
Rev. 4 — 14 February 2014
Product data sheet
1. General description
The SA614A is an improved monolithic low-power FM IF system. It incorporates two
limiting intermediate frequency amplifiers, quadrature detector, muting, logarithmic
received signal strength indicator, and voltage regulator. The SA614A features higher IF
bandwidth (25 MHz) and temperature compensated RSSI and limiters permitting higher
performance application compared with the SA604. The SA614A is available in a SO
(surface-mounted miniature) package.
2. Features and benefits
Low power consumption: 3.3 mA typical
Temperature compensated logarithmic RSSI with a 90 dB dynamic range
Two audio outputs - muted and unmuted
Low external component count; suitable for crystal/ceramic filters
Excellent sensitivity: 1.5 V across inputs pins (0.22 V into 50 matching network)
for 12 dB SINAD (SIgnal-to-Noise-And-Distortion ratio) for 1 kHz tone with RF at
45 MHz and IF at 455 kHz
SA614A meets cellular radio specifications
3. Applications
Cellular radio FM IF
High performance communication receiver
Intermediate frequency amplification and detection up to 25 MHz
RF level meter
Spectrum analyzer
Instrumentation
FSK and ASK data receivers
4. Ordering information
Table 1. Ordering information
Tamb = 40 C to +85 C
Type number Package
Name
Description
SA614AD
SO16
plastic small outline package; 16 leads; body width 3.9 mm
SA614AHR
HXQFN16 plastic thermal enhanced extremely thin quad flat package; no leads;
16 terminals; body 3 3 0.5 mm
Version
SOT109-1
SOT1039-2
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GND
16 15 14 13
12 11 10
9
42 kΩ
42 kΩ
700 Ω
1.6
kΩ
40 kΩ
FULL WAVE
RECT.
VEE
VOLT
REG
BAND
GAP VOLT
VCC
1
Fig 4. Equivalent circuit
2
GND
700 Ω
7 kΩ
1.6
kΩ
40 kΩ
35 kΩ
FULL WAVE
RECT.
VOLTAGE/
CURRENT CONVERTER
VOLT
REG
MUTE
VCC
80 kΩ
3
4
VCC
55 kΩ
5
55 kΩ
6
2 kΩ
4.5 kΩ
2 kΩ 8 kΩ
QUAD
DET
40 kΩ
40 kΩ
80 kΩ
7
80 kΩ
8
aaa-009760
5 Page 
NXP Semiconductors
SA614A
Low power FM IF system
13.2 IF amplifiers
The IF amplifier section consists of two log-limiting stages. The first consists of two
differential amplifiers with 39 dB of gain and a small signal bandwidth of 41 MHz (when
driven from a 50 source). The output of the first limiter is a low impedance emitter
follower with 1 k of equivalent series resistance. The second limiting stage consists of
three differential amplifiers with a gain of 62 dB and a small signal AC bandwidth of
28 MHz. The outputs of the final differential stage are buffered to the internal quadrature
detector. One of the outputs is available at pin LIMITER_OUTPUT to drive an external
quadrature capacitor and L/C quadrature tank.
Both of the limiting amplifier stages are DC biased using feedback. The buffered output of
the final differential amplifier is fed back to the input through 42 kresistors. As shown in
Figure 4, the input impedance is established for each stage by tapping one of the
feedback resistors 1.6 k from the input. It requires one additional decoupling capacitor
from the tap point to ground.
15
16
1
42 kΩ
1.6 kΩ
40 kΩ
Fig 8. First limiter bias
V+
700 Ω
14
7 kΩ
aaa-009978
42 kΩ
9 V+
11
12
40 kΩ
10
40 kΩ
8
80 kΩ
aaa-009762
Fig 9. Second limiter and quadrature detector
BPF
BPF
Fig 10. Feedback paths
aaa-009763
SA614A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 14 February 2014
© NXP B.V. 2014. All rights reserved.
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| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet SA614A.PDF ] | |
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