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TCM4400EGGM Datasheet(PDF) 10 Page - Texas Instruments |
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TCM4400EGGM Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 64 page  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† tsu2 Setup time, BULON ↑ to BCAL↑ 15 µs tw1 Pulse duration, BCAL high 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 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 k Ω 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 Ω 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 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 dB Frequency response of the total path with values referenced to 18 kHz 135 kHz –40 dB 200 kHz –40 400 kHz –40 |
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