SA614AD/01,118 NXP Semiconductors, SA614AD/01,118 Datasheet - Page 8
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SA614AD/01,118
Manufacturer Part Number
SA614AD/01,118
Description
IC FM IF SYSTEM LOW PWR 16-SOIC
Manufacturer
NXP Semiconductors
Datasheet
1.SA614AD01118.pdf
(14 pages)
Specifications of SA614AD/01,118
Package / Case
16-SOIC (0.154", 3.90mm Width)
Function
FM IF System
Frequency
25MHz
Rf Type
Cellular, ASK, FSK
Secondary Attributes
RSSI Equipped
Mounting Style
SMD/SMT
Operating Supply Voltage
5 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
568-2446-2
935275282118
SA614AD/01,18
SA614AD/01-T
935275282118
SA614AD/01,18
SA614AD/01-T
Philips Semiconductors
Because of the very high gain, bandwidth and input impedance of
the limiters, there is a very real potential for instability at IF
frequencies above 455kHz. The basic phenomenon is shown in
Figure 8. Distributed feedback (capacitance, inductance and
radiated fields) forms a divider from the output of the limiters back to
the inputs (including RF input). If this feedback divider does not
1997 Nov 07
12
Low power FM IF system
11
10
Figure 7. Second Limiter and Quadrature Detector
42k
40k
BPF
a. Terminating High Impedance Filters with Transformation to Low Impedance
BPF
HIGH IMPEDANCE
Figure 10. Crystal Input Filter with Ceramic Interstage Filter
b. Low Impedance Termination and Gain Reduction
9
Figure 9. Practical Termination
V+
RESISTIVE LOSS INTO BPF
80k
SR00329
40k
LOW IMPEDANCE
8
A
430
8
cause attenuation greater than the gain of the forward path, then
oscillation or low level regeneration is likely. If regeneration occurs,
two symptoms may be present: (1)The RSSI output will be high with
no signal input (should nominally be 250mV or lower), and (2) the
demodulated output will demonstrate a threshold. Above a certain
16
1
BPF
BPF
15
2
14
3
13
4
HIGH IMPEDANCE
614A
Figure 8. Feedback Paths
12
5
BPF
430
11
6
10
SR00332
7
9
8
BPF
SR00331
Product specification
SA614A
SR00330