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參數(shù)資料
| 型號： | TMS320DM642GDK500 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Adjustable 2.5-36V +/-2.2% Tolerance, 1-100mA Shunt Regulator - PB Free; Package: SOIC-8 Narrow Body; No of Pins: 8; Container: Tape and Reel; Qty per Container: 2500 |
| 中文描述： | 視頻/影像定點數(shù)字信號處理器 |
| 文件頁數(shù)： | 109/123頁 |
| 文件大小： | 1205K |
| 代理商： | TMS320DM642GDK500 |
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www.ti.com
6.9.7
On-Chip Analog-to-Digital Converter
TMS320F2808, TMS320F2806
TMS320F2801, UCD9501
Digital Signal Processors
SPRS230F–OCTOBER 2003–REVISED SEPTEMBER 2005
Table 6-36. ADC Electrical Characteristics (over recommended operating conditions)
(1)(2)
PARAMETER
DC SPECIFICATIONS
Resolution
ADC clock
MIN
TYP
MAX
UNIT
12
1
Bits
kHz
MHz
12.5
ACCURACY
INL (Integral nonlinearity)
DNL (Differential nonlinearity)
(3)
Offset error
(4)
Offset error with hardware trimming
Overall gain error with internal reference
(5)
Overall gain error with external reference
Channel-to-channel offset variation
Channel-to-channel gain variation
ANALOG INPUT
Analog input voltage (ADCINx to ADCLO)
(6)
ADCLO
Input capacitance
Input leakage current
INTERNAL VOLTAGE REFERENCE
(5)
V
- ADCREFP output voltage at the pin based on
internal reference
V
- ADCREFM output voltage at the pin based on
internal reference
Voltage difference, ADCREFP - ADCREFM
Temperature coefficient
EXTERNAL VOLTAGE REFERENCE
(5)(7)
1-12.5 MHz ADC clock (6.25 MSPS)
1-12.5 MHz ADC clock (6.25 MSPS)
±
1.5
±
1
+60
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
-60
±
4
-60
-60
+60
+60
±
4
±
4
0
3
5
V
-5
0
mV
pF
μ
A
10
±
5
1.275
V
0.525
V
0.75
50
V
PPM/
°
C
ADCREFSEL[15:14] = 11b
ADCREFSEL[15:14] = 10b
ADCREFSEL[15:14] = 01b
1.024
1.500
2.048
V
V
V
V
ADCREFIN
- External reference voltage input on ADCREFIN
AC SPECIFICATIONS
SINAD (100 kHz) Signal-to-noise ratio + distortion
SNR (100 kHz) Signal-to-noise ratio
THD (100 kHz) Total harmonic distortion
ENOB (100 kHz) Effective number of bits
SFDR (100 kHz) Spurious free dynamic range
67.5
68
-79
10.9
83
dB
dB
dB
Bits
dB
(1)
(2)
(3)
(4)
(5)
Tested at 12.5 MHz ADCCLK.
All voltages listed in this table are with respect to V
.
TI specifies that the ADC will have no missing codes.
1 LSB has the weighted value of 3.0/4096 = 0.732 mV.
A single internal/external band gap reference sources both ADCREFP and ADCREFM signals, and hence, these voltages track
together. The ADC converter uses the difference between these two as its reference. The total gain error listed for the internal reference
is inclusive of the movement of the internal bandgap over temperature. Gain error over temperature for the external reference option will
depend on the temperature profile of the source used.
Voltages above V
+ 0.3 V or below V
- 0.3 V applied to an analog input pin may temporarily affect the conversion of another pin.
To avoid this, the analog inputs should be kept within these limits.
TI recommends using high precision external reference TI part REF3020/3120 or equivalent for 2.048-V reference.
(6)
(7)
Electrical Specifications
109
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