Philips Semiconductors

Product data

SA2400A

Single chip transceiver for 2.45 GHz ISM band

2002 Nov 04

11

Specification

Units

Max

Typ

Min

Conditions

LO leakage to antenna

All gain modes. Incl balun

–

–75

–57

dBm

Residual sideband Rejection

Measured with single tone at 2 MHz offset from

carrier. Includes both IQ gain and phase error.

Notes 3, 7.

22

29

–

dB

Ripple band width of filter

Note 4.

5.6

6.3

7.0

MHz

3 dB band width of filter

Indicative, not tested.

Note 4.

–

7

–

MHz

In-band amplitude ripple

DC to ripple band width edge.

Note 3.

–

–

0.6

dB peak

Out-of-band attenuation

Relative to minimum in-band gain

> 11 MHz

25

–

–

dB

> 22 MHz

55

–

–

dB

Lower 3 dB cut-off frequency of AC

li

Cascade of two 1st order high-pass filters.

coupling

a) NARROW BAND

–

10

–

kHz

b) INTERMEDIATE BAND

–

100

–

kHz

c) WIDE BAND

–

1000

–

kHz

Output load resistance

Pin to GND, differential.

Note 5.

15

–

–

k

Ω

Output load capacitance

Pin to GND

–

–

6

pF

Nominal I & Q output voltage

Differential at the load specified.

Note 6.

–

0.5

–

V peak

Maximum I & Q output voltage

Saturated, differential

–

–

1.5

V peak

Common mode IQ voltage

Programmable (see 0x04)

Mode 1

Mode 2

1.0

1.25

1.5

V

1 dB compression level at output

1 MHz tone, differential. Maximum gain.

1

–

–

V peak

Total Harmonic Distortion

(measured at max and min gains)

Input 1 – 5 MHz signal, 1 V peak differential

sinusoidal at output, output spurs measured

differential up to 100 MHz. Ratio of rms total

spurious distortion to rms fundamental.

Receiver in minimum gain.

Note 3.

–

2

4

%

Receiver in maximum gain.

Note 3.

–

5

10

%

Phase Imbalance

Signal tone input at 2 MHz offset from carrier.

Indicative, not tested.

–

4

–

deg

I, /I to Q, /Q amplitude imbalance

ratio of signal at I pin to /I pin;

Same for Q and /Q pins.

–

0.1

–

dB

RSSI voltage in settled state

(internal AGC)

Corresponds to I, Q output signal levels when

AGC_RESET is used, with RF input

between –10 and –80 dBm.

1 MHz tone, 0.5 V peak differential.

ACGTARGET = 0

1.25

1.55

1.95

V

RSSI voltage difference

1 dB change in input power compared to

settled state

–

64.5

–

mV

RSSI minimum voltage

Signal power = –10 dBc

–

0.9

–

V

RSSI maximum output voltage

Signal power = +10 dBc

–

2.2

–

V

RSSI error

–10 dBc < signal power < +10 dBc

–

±1

–

dB

NOTES:

1. Corresponds to –15 dBm input level at IC input, assuming typical 5 dB loss from the antenna to the IC input. The AGCTARGET register

should be set to “+5” which causes the AGC to settle to an output amplitude greater than the specified nominal value. A resistive divider

network at the output can be used to adjust the actual IQ output levels to the BB ADC range.

2. Guaranteed by design.

3. Verified by bench characterization and found to have sufficient margin for production.

4. At power-up time, the filter bandwidth is undefined. It needs to be calibrated with the internal tuner (FCALIB mode).

5. For unsymmetrical loading, attach the same load impedance to the unused pin; condition: for 80% of nominal output voltage swing.

6. Nominal I/Q output levels are understood as the levels the SA2400A will settle to after an AGCRESET action is performed with an RF input

signal modulated by a Barker sequence, and with AGCTARGET = 0.