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| 型号： | THS1030CPWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | GREEN, PLASTIC, TSSOP-28 |
| 文件页数： | 6/37页 |
| 文件大小： | 727K |
| 代理商： | THS1030CPWR |
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THS1030
3V TO 5.5V, 10BIT, 30 MSPS
CMOS ANALOGTODIGITAL CONVERTER
SLAS243E NOVEMBER 1999 REVISED DECEMBER 2003
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
ADC reference generation
The THS1030 has three primary modes of ADC reference generation, selected by the voltage level applied to
the MODE pin.
Connecting the MODE pin to AGND gives full external reference mode. In this mode, the user supplies the ADC
reference voltages directly to pins REFTF and REFBF. This mode is used where there is need for minimum
power drain or where there are very tight tolerances on the ADC reference voltages. This mode also offers the
possibility of Kelvin connection of the reference inputs to the THS1030 to eliminate any voltage drops from
remote references that may occur in the system. Only single-ended input is possible in this mode.
Connecting the MODE pin to AVDD/2 gives differential mode. In this mode, the ADC reference voltages REFTF
and REFBF are generated by the internal reference buffer from the voltage applied to the VREF pin. This mode
is suitable for handling differentially presented inputs, which are applied to the AIN and REFTS/REFBS pins.
A special case of differential mode is center span mode, in which the user applies a single-ended signal to AIN
and applies the mid-scale input voltage (VM) to the REFTS and REFBS pins.
Connecting the MODE pin to AVDD gives top/bottom mode. In this mode, the ADC reference voltages REFTF
and REFBF are generated by the internal reference buffer from the voltages applied to the REFTS and REFBS
pins. Only single-ended input is possible in top/bottom mode.
When MODE is connected to AGND, the internal reference buffer is powered down, its inputs and outputs
disconnected, and REFTS and REFBS internally connected to REFTF and REFBF respectively. These nodes
are connected by the user to external sources to provide the ADC reference voltages. The internal connections
are designed for use in kelvin connection mode (Figure 14). When using external reference mode as shown
in Figure 13, REFTS must be shorted to REFTF and REFBS must be shorted to REFBF externally. The mean
of REFTF and REFBF must be equal to AVDD/2. See Figure 13.
Table 1. Typical Set of Reference Connections
REFERENCE MODE
MODE
REFSENSE
VREF
VOLTAGE
REFTS, REFBS
ANALOG INPUT
FIGURES
External
AGND
AVDD
Disabled
Reference buffer powered
down, reference voltage
provided directly by REFT
and REFB
Single-ended
12, 13, 14
VREF
1 V
Externally connect REFTS to
Internal
AVDD/2
AGND
2 V
Externally connect REFTS to
REFBS. This pair then forms
Differential or
center span
15, 16, 17
Internal
AVDD/2
External
divider
1 + Ra/Rb
(see Figure 22)
REFBS. This pair then forms
AIN to the ADC.
Differential or
center span
15, 16, 17
External (through internal
reference buffer)
AVDD
Disabled
Single-ended
Output of VREF can be
AVDD
VREF
1 V
REFTS = VFS+
Single-ended
(top-bottom
18, 19
Output of VREF can be
externally tied to REFTS or
AVDD
AGND
2 V
REFTS = VFS+
REFBS = VFS
(top-bottom
mode)
18, 19
externally tied to REFTS or
REFBS to provide one of the
reference voltages
External
divider
1 + Ra/Rb
(see Figure 22)
REFBS = VFS
mode)
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