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參數(shù)資料
| 型號： | ADS1601IPFBR |
| 元件分類： | ADC |
| 英文描述： | 16-BIT 1.25MSPS ANALOG TO DIGITAL CONVERTER |
| 中文描述： | 16位1.25MSPS時模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大?。?/td> | 386K |
| 代理商： | ADS1601IPFBR |
SBAS322 DECEMBER 2004
www.ti.com
17
REFERENCE INPUTS (VREFN, VREFP, VMID)
The ADS1601 can operate from an internal or external
voltage reference. In either case, the reference voltage
V
REF
is set by the differential voltage between VREFN and
VREFP: V
REF
= (VREFP – VREFN). VREFP and VREFN
each use two pins, which should be shorted together.
VMID equals approximately 2.5V and is used by the
modulator. VCAP connects to an internal node and must
also be bypassed with an external capacitor.
INTERNAL REFERENCE (REFEN = LOW)
To use the internal reference, set the REFEN pin low. This
activates the internal circuitry that generates the reference
voltages. The internal reference voltages are applied to
the pins. Good bypassing of the reference pins is critical
to achieve optimum performance and is done by placing
the bypass capacitors as close to the pins as possible.
Figure 40 shows the recommended bypass capacitor
values. Use high-quality ceramic capacitors for the smaller
values. Avoid loading the internal reference with external
circuitry. If the ADS1601 internal reference is to be used by
other circuitry, buffer the reference voltages to prevent
directly loading the reference pins.
10
μ
F
0.1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
0.1
μ
F
ADS1601
AGND
VREFP
VREFP
VMID
VCAP
VREFN
VREFN
Figure 40. Reference Bypassing When Using the
Internal Reference
EXTERNAL REFERENCE (REFEN = HIGH)
To use an external reference, set the REFEN pin high. This
deactivates the internal generators for VREFP, VREFN
and VMID, and saves approximately 25mA of current on
the analog supply (AVDD). The voltages applied to these
pins must be within the values specified in the Electrical
Characteristics table. Typically, VREFP = 4V, VMID = 2.5V
and VREFN = 1V. The external circuitry must be capable
of providing both a dc and a transient current. Figure 41
shows a simplified diagram of the internal circuitry of the
reference when the internal reference is disabled. As with
the input circuitry, switches S1 and S2 open and close as
shown by the timing in Figure 37.
S
1
ADS1601
S
2
VREFP
VREFP
50pF
300
S
1
VREFN
VREFN
Figure 41. Conceptual Internal Circuitry for the
Reference When REFEN = High
Figure 42 shows the recommended circuitry for driving
these reference inputs. Keep the resistances used in the
buffer circuits low to prevent excessive thermal noise from
degrading performance. Layout of these circuits is critical;
be sure to follow good high-speed layout practices. Place
the buffers, and especially the bypass capacitors, as close
to the pins as possible. VCAP is unaffected by the setting
on REFEN and must be bypassed when using the internal
or an external reference.
10
μ
F
0.1
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
0.1
μ
F
0.1
μ
F
VREFP
VREFP
VMID
VCAP
VREFN
VREFN
392
OPA2822
ADS1601
0.001
μ
F
4V
392
OPA2822
0.001
μ
F
1V
392
OPA2822
0.001
μ
F
2.5V
AGND
Figure 42. Recommended Buffer Circuit When
Using an External Reference
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1601IPFBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1601IPFBT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1601IPFBTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1602EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1602EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS1602IPFBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 2.5MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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