2.4GHz 802.11b Zero-IF Transceivers

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7

AC ELECTRICAL CHARACTERISTICS—SYSTEM TIMING (continued)

AC ELECTRICAL CHARACTERISTICS—SERIAL INTERFACE TIMING

°C, unless otherwise noted.

(Note 11)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Standby-to-Receive Mode

±30kHz, relative to rising edge of RX_ON

5µs

Standby-to-Transmit Mode

±30kHz, relative to rising edge of TX_ON

10

µs

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SERIAL INTERFACE TIMING (See Figure 1)

SCLK rising edge to CSB falling edge wait time

5

ns

Falling edge of CSB to rising edge of first SCLK time

5

ns

Data-to-serial clock setup time

5

ns

Data-to-clock hold time

10

ns

Serial clock pulse-width high

10

ns

Clock pulse-width low

10

ns

Last SCLK rising edge to rising edge of CSB

5

ns

CSB high pulse width

10

ns

Time between the rising edge of CSB and the next rising edge of SCLK

5

ns

Clock frequency

50

MHz

Note 1:

Parameters are production tested at +25

°C only. Min/max limits over temperature are guaranteed by design and charac-

terization.

Note 2:

Defined as the baseband differential RMS output voltage divided by the RMS input voltage (at the RF balun input).

Note 3:

Noise-figure specification excludes the loss of the external balun. The external balun loss is typically ~0.5dB.

Note 4:

CCK interferer at 25MHz offset. Desired signal equals -73dBm. Interferer amplitude increases until baseband output from

Note 5:

Measured at balun input. Two CW tones at -43dBm with 15MHz and 25MHz spacing from the MAX2820/MAX2821 channel

frequency. IP3 is computed from 5MHz IMD3 product measured at the RX I/Q output.

Note 6:

Two CW interferers at -38dBm with 24.5MHz and 25.5MHz spacing from the MAX2820/MAX2821 channel frequency. IP2 is

computed from the 1MHz IMD2 product measured at the RX I/Q output.

Note 7:

Output power measured after the matching and balun. TX gain is set to maximum.

Note 8:

Adjacent and alternate channel power relative to the desired signal. TX gain is adjusted until the output power is -1dBm.

Power measured with 100kHz video BW and 100kHz resolution BW.

Note 9:

Time required to reprogram the PLL, change the operating channel, and wait for the operating channel center frequency to

settle within

±10kHz of the nominal (final) channel frequency.

Note 10: Relative amplitude of reference spurious products appearing in the TX RF output spectrum relative to a CW tone at

0.5MHz offset from the LO.

Note 11: Min/max limits are guaranteed by design and characterization.