SA615

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© NXP Semiconductors N.V. 2014. All rights reserved.

Product data sheet

Rev. 4 — 14 November 2014

7 of 26

NXP Semiconductors

SA615

High performance low power mixer FM IF system

10. Dynamic characteristics

Table 7.

Dynamic characteristics

IF frequency = 455 kHz; R17 = 5.1 k

Audio output with C-message weighted filter and de-emphasis capacitor. Test circuit Figure 7. The parameters listed below

are tested using automatic test equipment to assure consistent electrical characteristics. The limits do not represent the

ultimate performance limits of the device. Use of an optimized RF layout improves many of the listed parameters.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Mixer/oscillator section (external LO = 300 mV)

input frequency

-

500

-

MHz

oscillator frequency

-

150

-

MHz

NF

noise figure

at 45 MHz

-

5.0

-

dB

input third-order intercept point

FL1 = 45.0 MHz; FL2 = 45.06 MHz

-

12

-

dBm

conversion power gain

matched 14.5 dBV step-up

8.0

13

-

dB

50

 source

-

1.7

-

dB

RF input resistance

single-ended input

3.0

4.7

-

k



RF input capacitance

-

3.5

4.0

pF

mixer output resistance

MIXER_OUT pin

1.25

1.50

-

k



IF section

IF amplifier gain

50

 source

-

39.7

-

dB

limiter gain

50

 source

-

62.5

-

dB

IF input power

for

3 dB input limiting sensitivity;

R17=5.1k

; test at IF_AMP_IN pin

-

109

-

dBm



AM

AM rejection

80 % AM 1 kHz

25

33

43

dB

audio level

RMS value; R10 = 100 k

;

15 nF de-emphasis

60

150

260

mV

unmuted audio level

R11 = 100 k

; 150 pF de-emphasis

-

530

-

mV

SINAD

signal-to-noise-and-distortion ratio

RF level

118 dB

-

12

-

dB

THD

total harmonic distortion

30

42

-

dB

S/N

signal-to-noise ratio

no modulation for noise

-

68

-

dB

RSSI output voltage

IF; R9 = 100 k



[1]

IF level =

118 dBm

0

160

800

mV

IF level =

68 dBm

1.7

2.5

3.3

V

IF level =

18 dBm

3.6

4.8

5.8

V



RSSI(range)

RSSI range

R9 = 100 k

; IF_AMP_OUT pin

-

80

-

dB



RSSI

RSSI variation

R9 = 100 k

; IF_AMP_OUT pin

-

2-

dB

IF input impedance

1.40

1.6

-

k



IF output impedance

0.85

1.0

-

k



limiter input impedance

1.40

1.6

-

k



output resistance

unmuted audio

-

58

-

k



muted audio

-

58

-

k

