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參數(shù)資料
| 型號： | TCM4400EGGM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT |
| 中文描述： | 的GSM / DCS的基帶和語音的A / D和D / A射頻接口電路 |
| 文件頁數(shù)： | 10/64頁 |
| 文件大?。?/td> | 888K |
| 代理商： | TCM4400EGGM |
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TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
10
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
μ
s
μ
s
μ
s
1/4-bit
tsu2
tw1
tsu3
tw2
th2
th3
tdd(mod)
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.
Setup time, BULON
↑
to BCAL
↑
Pulse duration, BCAL high
Setup time, BCAL low before BENA
↑
Pulse duration, BENA high
15
132
0
N effective duration of burst controlled by BENA
N–32
Hold time, modulation low after BENA low
Hold time, BULON
↓
after APC low
Input-to-output modulator delay
32
1/4 bit
1
bit
(Digital delay of modulator)
1.5
bit
baseband downlink path
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Dynamic range on each input
Centered on external common
mode (VBDLCOM)
DLQP–DLQN or DLIP–DLIN
VVREF
Vpp
Differential input dynamic range
2*VVREF
Vpp
Differential input resistance at BDLQP–BDLQN or
BDLIP–BDLIN
130
200
270
k
Differential input capacitance at BDLQP–BDLQN or
BDLIP–BDLIN
1.5
4
6.5
pF
Single ended input resistance at BDLQPor BDLQN or BDLIP
or BDLIN to ground.
90
130
180
k
Single ended input capacitance at BDLQP or BDLQN or
BDLIP or BDLIN to ground.
6
8
12
pF
External common-mode input voltage: VBDLCOM
0.8
VDD/2
VDD–0.8
V
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
0
60
LSB
Offset error after calibration,
±
21 on 16-bit I and Q words
–2
0
2
LSB
Offset correction range
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.
Full scale
channel characteristics
frequency response – baseband downlink path
PARAMETER
MIN
–0.3
TYP
MAX
0.25
UNIT
< 67.5 Hz
67.5 kHz
–0.3
0.25
Frequency response of the total path with values referenced to 18 kHz
96 kHz
–4
0.3
dB
135 kHz
–40
200 kHz
400 kHz
–40
–40
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