SA614AD/01,118 NXP Semiconductors, SA614AD/01,118 Datasheet - Page 11
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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
optimized at 0.22 V for 12dB SINAD with minor change in the RSSI
linearity.
Any application which requires optimized RSSI linearity, such as
spectrum analyzers, cellular radio, and certain types of telemetry,
will require careful attention to limiter interstage component
selection. This will be especially true with high IF frequencies which
require insertion loss or impedance reduction for stability.
At low frequencies the RSSI makes an excellent logarithmic AC
voltmeter.
For data applications the RSSI is effective as an amplitude shift
keyed (ASK) data slicer. If a comparator is applied to the RSSI and
the threshold set slightly above the no signal level, when an in-band
signal is received the comparator will be sliced. Unlike FSK
1997 Nov 07
Low power FM IF system
200
175
150
125
100
75
50
25
0
0.95
Q = 10
Q = 20
Figure 12. Phase vs Normalized IF Frequency
0.975
Q = 100
Q = 80
Q = 60
11
demodulation, the maximum data rate is somewhat limited. An
internal capacitor limits the RSSI frequency response to about
100kHz. At high data rates the rise and fall times will not be
symmetrical.
The RSSI output is a current-to-voltage converter similar to the
audio outputs. However, an external resistor is required. With a
91k
the input amplitude.
Additional Circuitry
Internal to the SA614A are voltage and current regulators which
have been temperature compensated to maintain the performance
of the device over a wide temperature range. These regulators are
not accessible to the user.
1.0
resistor, the output characteristic is 0.5V for a 10dB change in
I
1
1.025
I
Product specification
SA614A
SR00334
1.05