TCM4400 Datasheet, PDF (16/72 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

2.3.2 Voltage References
REFERENCE
VGAP Voltage on band gap (used for all other references)
Band gap output resistance
Band gap external decoupling capacitance
Band gap start time (bit CHGUP = 0)
Band gap start time (bit CHGUP = 1)
VREF
Voltage reference of GMSK internal ADC and DAC: VVREF
Voltage reference output resistance
Voltage reference external decoupling capacitance
Voltage reference start time (bit CHGUP = 0)
Voltage reference start time (bit CHGUP = 1)
VMID
Common-mode reference for baseband uplink: VVMID (bit SELV-
MID = 0)
Common-mode reference for baseband uplink: VVMID (bit SELV-
MID = 1)
Load resistance on VMID output
MICBIAS Microphone-driving voltage (bit MICBIAS = 0)
Microphone-driving voltage (bit MICBIAS = 1)
Microphone-bias current drive capability (bit MICBIAS = 1)
Microphone-bias current drive capability (bit MICBIAS = 0)
ADCMID DC bias reference of the auxiliary ADCs
ADCMID external decoupling capacitance
IBIAS
Bias current adjust external resistance
MIN TYP
1.16 1.22
200
0.1
100
2.5
1.66 1.75
200
0.1
300
10
–10% VDD /2
MAX
1.28
1.84
10%
UNIT
Vdc
kΩ
µF
ms
ms
Vdc
kΩ
µF
ms
ms
Vdc
1.25 1.35 1.45 Vdc
10
kΩ
1.80
2 2.20 Vdc
2.25
2.5 2.75 Vdc
450 500
µA
350 400
µA
–10% VDD /2 10% Vdc
0.1
µF
100
kΩ
2.3.3 Master Clock Input (MCLK)
Master clock signal frequency
Master clock duty cycle (sine wave)
Maximum peak-to-peak amplitude
Minimum peak-to-peak amplitude
Common-mode input voltage
Input resistance at 13 MHz (MCLK to ground)
Input capacitance at 13 MHz (MCLK to ground)
MIN
40
0.5
VSS + 0.5
4.1
12.5
NOM
13
MAX
60
1.3
VDD – 0.5
5
6.5
15
18
UNIT
MHz
%
Vpp
Vpp
Vdc
kΩ
pF
2–2