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
T
amb
=
40
C to +85
C
Type number
SA614AD
SA614AHR
Package
Name
SO16
HXQFN16
Description
plastic small outline package; 16 leads; body width 3.9 mm
plastic thermal enhanced extremely thin quad flat package; no leads;
16 terminals; body 3
3
0.5 mm
Version
SOT109-1
SOT1039-2
NXP Semiconductors
SA614A
Low power FM IF system
5. Block diagram
GND
16 (13)
15 (12)
14 (11)
13 (10)
12 (9)
11 (8)
10 (7)
9 (6)
IF
AMP
SIGNAL
STRENGTH
VOLTAGE
REGULATOR
1 (14)
2 (15)
GND
3 (16)
4 (1)
V
CC
LIMITER
QUAD
DET
MUTE
5 (2)
6 (3)
7 (4)
8 (5)
aaa-009746
Pin numbers for SO16; HXQFN16 pins shown in parentheses.
Fig 1.
Block diagram of SA614A
SA614A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 14 February 2014
2 of 28
NXP Semiconductors
SA614A
Low power FM IF system
6. Pinning information
6.1 Pinning
IF_AMP_DECOUPL
GND
MUTE_INPUT
V
CC
RSSI_OUTPUT
MUTE_AUD_OUTP
UNMUTE_AUD_OUTP
QUADRATURE_INPUT
1
2
3
4
16 IF_AMP_INPUT
15 IF_AMP_DECOUPL
14 IF_AMP_OUTPUT
13 GND
SA614A
5
6
7
8
aaa-009743
12 LIMITER_INPUT
11 LIMITER_DECOUPL
10 LIMITER_DECOUPL
9
LIMITER_OUTPUT
Fig 2.
Pin configuration for SO16
14 IF_AMP_DECOUPL
terminal 1
index area
V
CC
RRSI_OUTP
MUTE_AUD_OUTP
UNMUTE_AUD_OUTP
1
2
13 IF_AMP_INPUT
12 IF_AMP_DECOUPL
11 IF_AMP_OUTPUT
10 GND
9
16 MUTE_INPUT
3
4
5
SA614A
(1)
15 GND
LIMITER_INPUT
6
7
LIMITER_DECOUPL
QUADRATURE_INPUT
LIMITER_OUTPUT
LIMITER_DECOUPL
8
aaa-009745
Transparent top view
(1) Die Attach Paddle (DAP).
Fig 3.
Pin configuration for HXQFN16
SA614A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 14 February 2014
3 of 28
NXP Semiconductors
SA614A
Low power FM IF system
6.2 Pin description
Table 2.
Symbol
IF_AMP_DECOUPL
GND
MUTE_INPUT
V
CC
RSSI_OUTPUT
MUTE_AUD_OUTP
UNMUTE_AUD_OUTP
QUADRATURE_INPUT
LIMITER_OUTPUT
LIMITER_DECOUPL
LIMITER_DECOUPL
LIMITER_INPUT
GND
IF_AMP_OUTPUT
IF_AMP_DECOUPL
IF_AMP_INPUT
-
[1]
Pin description
Pin
SO16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
-
HXQFN16
14
15
16
1
2
3
4
5
6
7
8
9
10
[1]
11
12
13
DAP
IF amplifier decoupling
ground
mute input
supply voltage
RSSI output
mute audio output
unmute audio output
quadrature input
limiter output
limiter decoupling
limiter decoupling
limiter input
ground
IF amplifier output
IF amplifier decoupling
IF amplifier input
exposed Die Attach Paddle
Description
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.
SA614A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 4 — 14 February 2014
4 of 28
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Product data sheet
Rev. 4 — 14 February 2014
5 of 28
SA614A
7. Functional description
NXP Semiconductors
GND
16
15
42 kΩ
14
13
12
11
42 kΩ
10
9
700 Ω
7 kΩ
1.6
kΩ
40 kΩ
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
700 Ω
1.6
kΩ
40 kΩ
FULL WAVE
RECT.
35 kΩ
FULL WAVE
RECT.
2 kΩ
4.5 kΩ
2 kΩ
8 kΩ
VOLTAGE/
CURRENT CONVERTER
V
EE
VOLT
REG
VOLT
REG
MUTE
QUAD
DET
V
CC
BAND
GAP VOLT
40 kΩ
40 kΩ
V
CC
80 kΩ
55 kΩ
55 kΩ
80 kΩ
80 kΩ
Low power FM IF system
1
2
GND
3
4
V
CC
5
6
7
8
aaa-009760
SA614A
Fig 4.
Equivalent circuit
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