TCM4400EPET datasheet(10/64 Pages) TI

10 / 64 page

TCM4400E

GSM/DCS BASEBAND AND VOICE A/D

AND D/A RF INTERFACE CIRCUIT

SLWS082A – JULY 1999 – REVISED MARCH 2000

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

timing requirements of baseband uplink path (continued)

fixed delays – baseband uplink path (see Figure 1)

MIN

NOM

MAX

UNIT†

tsu2

Setup time, BULON

↑ to BCAL↑

µs

tw1

Pulse duration, BCAL high

132

µs

tsu3

Setup time, BCAL low before BENA

↑

µs

tw2

Pulse duration, BENA high

N effective duration of burst controlled by BENA

N– 32

1/4-bit

th2

Hold time, modulation low after BENA low

1/4 bit

th3

Hold time, BULON

↓ after APC low

bit

tdd(mod)

Input-to-output modulator delay

(Digital delay of modulator)

1.5

bit

† Bit is relative to GSM bit = 1/270 kHz. Units can be a fractional part of the GSM bit as noted. Values in the above table are given for system

information only.

baseband downlink path

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Dynamic range on each input

Centered on external common

mode (VBDLCOM)

VVREF

Vpp

Differential input dynamic range

DLQP–DLQN or DLIP–DLIN

2*VVREF

Vpp

Differential input resistance at BDLQP–BDLQN or

BDLIP–BDLIN

130

200

270

Ω

Differential input capacitance at BDLQP–BDLQN or

BDLIP–BDLIN

1.5

6.5

Single ended input resistance at BDLQPor BDLQN or BDLIP

or BDLIN to ground.

130

180

Ω

Single ended input capacitance at BDLQP or BDLQN or

BDLIP or BDLIN to ground.

External common-mode input voltage: VBDLCOM

0.8

VDD/2

VDD–0.8

Range of digital output data

Maximum digital code value on

16-bit I and Q samples.

±21060

dc accuracy – baseband downlink path

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Offset error before calibration ‡

–60

LSB

Offset error after calibration,

± 21 on 16-bit I and Q words ‡

–2

LSB

Offset correction range

Full scale

‡ The LSB corresponds to the one of the ADC which is specified with 66 dB dynamic range (

±1024),which means 11-bit, but the output data bits

are transmitted through the serial interface with 16-bit words. On top of that, the decimation ratio of 24 (6.5 MHz/270 kHz) makes the maximum

code on a 16-bit word to be 21060 instead of 32767. So one LSB of the ADC corresponds to a value of 21060/1024 = 20.57 on the 16-bit output

serial words on I and Q.

channel characteristics

frequency response – baseband downlink path

PARAMETER

MIN

TYP

MAX

UNIT

< 67.5 Hz

– 0.3

0.25

67.5 kHz

– 0.3

0.25

Frequency response of the total path with values referenced to 18 kHz

96 kHz

–4

0.3

Frequency response of the total path with values referenced to 18 kHz

135 kHz

–40

200 kHz

–40

400 kHz

–40

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