TCM4400E Datasheet, PDF (10/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
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↑
tw1
Pulse duration, BCAL high
15
µs
132
µs
tsu3
Setup time, BCAL low before BENA↑
0
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
32
1/4 bit
th3
Hold time, BULON↓ after APC low
1
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
Dynamic range on each input
Differential input dynamic range
Differential input resistance at BDLQP–BDLQN or
BDLIP–BDLIN
TEST CONDITIONS
Centered on external common
mode (VBDLCOM)
DLQP–DLQN or DLIP–DLIN
MIN TYP
VVREF
2*VVREF
130 200
MAX
270
UNIT
Vpp
Vpp
kΩ
Differential input capacitance at BDLQP–BDLQN or
BDLIP–BDLIN
Single ended input resistance at BDLQPor BDLQN or BDLIP
or BDLIN to ground.
Single ended input capacitance at BDLQP or BDLQN or
BDLIP or BDLIN to ground.
External common-mode input voltage: VBDLCOM
Range of digital output data
Maximum digital code value on
16-bit I and Q samples.
1.5
4
6.5
pF
90 130
180
kΩ
6
8
12
pF
0.8 VDD/2 VDD–0.8 V
± 21060
dc accuracy – baseband downlink path
PARAMETER
Offset error before calibration ^‡
Offset error after calibration,
TEST CONDITIONS
± 21 on 16-bit I and Q words ^‡
MIN TYP
–60
0
–2
0
MAX
60
2
UNIT
LSB
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
Frequency response of the total path with values referenced to 18 kHz
< 67.5 Hz
67.5 kHz
96 kHz
135 kHz
200 kHz
400 kHz
MIN
– 0.3
– 0.3
–4
TYP MAX UNIT
0.25
0.25
0.3
dB
– 40
– 40
– 40
10
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265