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PDF SA604A Data sheet ( Hoja de datos )
| Número de pieza | SA604A | |
| Descripción | High-performance low-power FM IF system | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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SA604A
High-performance low-power FM IF system
Rev. 4 — 20 February 2015
Product data sheet
1. General description
The SA604A is an improved monolithic low-power FM IF system incorporating two limiting
intermediate frequency amplifiers, quadrature detector, muting, logarithmic received
signal strength indicator, and voltage regulator. The SA604A features higher IF bandwidth
(25 MHz) and temperature compensated RSSI and limiters permitting higher performance
application compared with the SA604. The SA604A is available in an SO16
(surface-mounted miniature) and HXQFN16 package.
2. Features and benefits
Low power consumption: 3.3 mA typical
Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with
a dynamic range in excess of 90 dB
Two audio outputs — muted and un-muted
Low external component count; suitable for crystal/ceramic filters
Excellent sensitivity: 1.5 V across input pins (0.22 V into 50 matching network) for
12 dB SINAD (Signal-to-Noise and Distortion ratio) at 455 kHz
SA604A meets cellular radio specifications
3. Applications
Cellular radio FM IF
High-performance communications receivers
Intermediate frequency amplification and detection up to 25 MHz
RF level meter
Spectrum analyzer
Instrumentation
FSK and ASK data receivers
1 page  
NXP Semiconductors
SA604A
High-performance low-power FM IF system
6.2 Pin description
Table 3. Pin description
Symbol
Pin
SO16
IF_AMP_DECOUPL
1
GND
2
MUTE_INPUT
3
VCC
RSSI_OUTPUT
4
5
MUTE_AUD_OUTP
6
UNMUTE_AUD_OUTP 7
QUADRATURE_INPUT 8
LIMITER_OUTPUT
9
LIMITER_DECOUPL
10
LIMITER_DECOUPL
11
LIMITER_INPUT
12
GND
13
IF_AMP_OUTPUT
14
IF_AMP_DECOUPL
15
IF_AMP_INPUT
16
--
Description
HXQFN16
14 IF amplifier decoupling
15 ground
16 mute input
1 supply voltage
2 RSSI output
3 mute audio output
4 unmute audio output
5 quadrature input
6 limiter output
7 limiter decoupling
8 limiter decoupling
9 limiter input
10[1]
ground
11 IF amplifier output
12 IF amplifier decoupling
13 IF amplifier input
DAP
exposed Die Attach Paddle
[1] HXQFN16 package supply ground is connected to both GND pin and exposed center pad. GND pin must
be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board
level performance, the exposed pad must be soldered to the board using a corresponding thermal pad on
the board. For proper heat conduction through the board, thermal vias must be incorporated in the PCB in
the thermal pad region.
SA604A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 20 February 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 31
5 Page 
NXP Semiconductors
SA604A
High-performance low-power FM IF system
SA604A IF INPUT (μV) (1500 Ω)
10 100 1 k 10 k 100 k
0
THD + NOISE
AM (80 % MOD)
NOISE
(dB)
−20
AUDIO
RSSI (VOLTS)
THD + NOISE
−40
−60 AM (80 % MOD)
−80 NOISE
RSSI
(V)
4
3
2
1
−120
−100
−80 −60
SA602A RF INPUT (dBm) (50 Ω)
−40
−20
aaa-012849
Audio output: C message weighted; 0 dB reference = recovered audio for 8 kHz peak deviation (dB)
Fig 7. Performance of the typical cellular radio application
13.1 Circuit description
The SA604A is a very high gain, high frequency device. Correct operation is not possible
if good RF layout and gain stage practices are not used. The SA604A cannot be
evaluated independent of circuit, components, and board layout. A physical layout which
correlates to the electrical limits is shown in Figure 17. This configuration can be used as
the basis for production layout.
The SA604A is an IF signal processing system suitable for IF frequencies as high as
21.4 MHz. The device consists of two limiting amplifiers, quadrature detector, direct audio
output, muted audio output, and signal strength indicator (with log output characteristic).
The equivalent circuit is shown in Figure 4.
Figure 7 is the performance of the typical cellular radio application shown in Figure 6 with
45 MHz RF input and 455 kHz IF.
SA604A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 20 February 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
11 of 31
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SA604A.PDF ] | |
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