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PDF SA615 Data sheet ( Hoja de datos )
| Número de pieza | SA615 | |
| Descripción | High performance low power mixer FM IF system | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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SA615
High performance low power mixer FM IF system
Rev. 4 — 14 November 2014
Product data sheet
1. General description
The SA615 is a high performance monolithic low-power FM IF system incorporating a
mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector,
muting, logarithmic Received Signal Strength Indicator (RSSI), and voltage regulator. The
SA615 combines the functions of NXP Semiconductors SA602A and SA604A, but
features a higher mixer input intercept point, higher IF bandwidth (25 MHz) and
temperature compensated RSSI and limiters permitting higher performance application.
The SA615 is available in 20-lead SO (surface-mounted miniature package) and 20-lead
SSOP (shrink small outline package).
The SA605 and SA615 are functionally the same device types. The difference between
the two devices lies in the guaranteed specifications. The SA615 has a higher ICC, lower
input third-order intercept point, lower conversion mixer gain, lower limiter gain, lower AM
rejection, lower SINAD, higher THD, and higher RSSI error than the SA615. Both the
SA605 and SA615 devices meet the EIA specifications for AMPS and TACS cellular radio
applications.
2. Features and benefits
Low power consumption: 5.7 mA typical at 6 V
Mixer input to >500 MHz
Mixer conversion power gain of 13 dB at 45 MHz
Mixer noise figure of 4.6 dB at 45 MHz
XTAL oscillator effective to 150 MHz (L/C oscillator to 1 GHz local oscillator can be
injected)
102 dB of IF amplifier/limiter gain
25 MHz limiter small signal bandwidth
Temperature-compensated logarithmic Received Signal Strength Indicator (RSSI) with
a dynamic range in excess of 90 dB
Two audio outputs — muted and unmuted
Low external component count; suitable for crystal/ceramic/LC filters
Excellent sensitivity: 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
SA615 meets cellular radio specifications
ESD hardened
1 page  
NXP Semiconductors
SA615
High performance low power mixer FM IF system
6.2 Pin description
Table 3. Pin description
Symbol
Pin
RF_IN
1
RF_BYPASS
2
OSC_OUT
3
OSC_IN
4
MUTE_INPUT
5
VCC
RSSI_OUT
6
7
MUTED_AUD_OUTP
8
UNMUTED_AUD_OUTP 9
QUADRATURE_IN
10
LIMITER_OUT
11
LIMITER_DECOUPL
12
LIMITER_DECOUPL
13
LIMITER_IN
14
GND
15
IF_AMP_OUT
16
IF_AMP_DECOUPL
17
IF_AMP_IN
18
IF_AMP_DECOUPL
19
MIXER_OUT
20
Description
RF input
RF bypass pin
oscillator output
oscillator input
mute input
positive supply voltage
RSSI output
mute audio output
unmute audio output
quadrature detector input terminal
limiter amplifier output
limiter amplifier decoupling pin
limiter amplifier decoupling pin
limiter amplifier input
ground; negative supply
IF amplifier output
IF amplifier decoupling pin
IF amplifier input
IF amplifier decoupling pin
mixer output
SA615
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 14 November 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
5 of 26
5 Page 
NXP Semiconductors
SA615
High performance low power mixer FM IF system
RF GENERATOR(1)
45 MHz
VCC (+6 V)
SA615 DEMOBOARD
RSSI(2)
DC VOLTMETER
AUDIO
DATA
C-MESSAGE(3)
SCOPE
HP339A DISTORTION
ANALYZER(4)
aaa-013153
(1) The C-message filter has a peak gain of 100 dB for accurate measurements. Without the gain, the
measurements may be affected by the noise of the scope and HP339 analyzer.
(2) Set your RF generator at 45.000 MHz, use a 1 kHz modulation frequency and a 6 kHz deviation if
you use 16 kHz filters, or 8 kHz if you use 30 kHz filters.
(3) The smallest RSSI voltage (that is, when no RF input is present and the input is terminated) is a
measure of the quality of the layout and design. If the lowest RSSI voltage is 250 mV or higher, it
means that the receiver is in regenerative mode. In that case, the receiver sensitivity is worse than
expected.
(4) The measured typical sensitivity for 12 dB SINAD should be 0.22 V or 120 dBm at the RF input.
Fig 5. SA615 application circuit test setup
SA615
Product data sheet
20
0
THD + NOISE
AM (80 % MOD)
NOISE
(dB) −20
RF = 45 MHz
IF = 455 kHz
VCC = 6 V
AUDIO REF = 174 mV (RMS value)
−40
−60
RSSI (V)
−80
THD + NOISE
AM (80 % MOD)
NOISE
6
RSSI
(V)
5
4
3
2
1
−100
−130
−110
−90
−70 −50 −30
RF input level (dBm)
Fig 6.
Audio out:
C message weighted
0 dB reference = recovered audio for 8 kHz peak deviation (dB)
Performance of the SA615 application board at 25 C
−10
0
10 20
aaa-012967
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 14 November 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
11 of 26
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet SA615.PDF ] | |
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