LP1071 Просмотр технического описания (PDF) - Freescale Semiconductor

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LP1071

802.11a/b/g Baseband System Solution

Freescale Semiconductor 

Functional Description

3.4 Analog Front End (AFE)

The Analog Front End (AFE) block consists of three Analog-to-Digital Converters (ADCs) and two

Digital-to-Analog Converters (DACs) as given in Table 2.

Table 2. AFE Components

Component

Description

Resolution

I/Q ADC

A 2-channel ADC whose digital output serves as input to digital baseband and

8-bit

whose input is the differential signal from the RF (RX mode).

I/Q DAC

A 2-channel DAC whose digital input is from baseband and output is a

8-bit

differential signal for the RF (TX mode).

RSSI ADC

A single ended, single channel ADC

6-bit

Auxiliary ADC A single ended, single channel ADC

8-bit

Auxiliary DAC A single ended, single channel DAC

8-bit

Clock

22 Msps

44 Msps

10 Msps

1 Msps

20 Msps

3.4.1 I/Q ADC

I/Q ADC specifications are shown in Table 3.

Table 3. I/Q ADC Specifications

Parameter

Condition

Min

Resolution

—

—

Maximum Sampling Frequency

—

22

Signal Bandwidth

—

—

Input impedance

Fixed capacitance

—

Switched capacitance @Fs

—

Latency

—

—

Integral Nonlinearity (INL)

—

—

Differential Nonlinearity (DNL)

—

—

Total Harmonic Distortion (THD)

Fin= 1MHz

—

Fin= 10MHz

—

SNR

Fin= 1MHz

—

Fin= 10MHz

—

ENOB

Fin= 1MHz

—

Fin= 10MHz

—

Channel-to-Channel mismatch

Gain

—

Phase

—

DC offset after calibration

—

–1

Wake-up time

From Shutdown

—

From Standby

—

Typ

8

—

11

1

1

4

±1.0

± 0.5

–48.5

–47

48.5

47

7.2

7.0

0.2

0.5

—

—

—

Max

Units

—

bit

—

MHz

—

MHz

—

pF

—

pF

—

cycles

—

LSB

—

LSB

—

dB

—

dB

—

dB

—

dB

—

bit

—

bit

—

dB

—

Degree

+1

LSB

1

ms

10

µs

LP1071 Advance Information, Rev. 0.5

Freescale Semiconductor

7

PRELIMINARY

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