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參數(shù)資料
| 型號： | AD7720BRU |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MODULATOR SIGMA-DELTA 28TSSOP |
| 標準包裝： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 12.5M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 215mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 28-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個差分，單極；1 個差分，雙極 |
AD7720
–6–
REV. 0
PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Function
1
REF2
Reference Input/Output. REF2 connects to the output of an internal buffer amplifier used
to drive the sigma-delta modulator. When REF2 is used as an input, REF1 must be con-
nected to AGND.
2, 14, 18, 20, 24, 26
AGND
Ground reference point for analog circuitry.
3, 13
NC
No Connect.
4
STBY
Standby, Logic Input. When STBY is high, the device is placed in a low power mode.
When STBY is low, the device is powered up.
5
DVAL
Data Valid Logic Output. A logic high on DVAL indicates that the data bit stream from
the AD7720 is an accurate digital representation of the analog voltage at the input to the
sigma-delta modulator. The DVAL pin is set low for 20 MCLK cycles if the analog input is
overranged.
6, 15
DGND
Ground reference for the digital circuitry.
7
GC
Digital Control Input. When GC is high, the gain error of the modulator can be calibrated.
8
BIP
Analog Input Range Select, Logic Input. A logic low on this input selects unipolar mode. A
logic high selects bipolar mode.
9
MZERO
Digital Control Input. When MZERO is high, the modulator inputs are internally grounded,
i.e., tied to AGND in unipolar mode and REF2 in bipolar mode. MZERO allows on-chip
offsets to be calibrated out. MZERO is low for normal operation.
10
DATA
Modulator Bit Stream. The digital bit stream from the sigma-delta modulator is output at
DATA.
11
SCLK
Serial Clock, Logic Output. The bit stream from the modulator is valid on the rising edge
of SCLK.
12
RESETO
Reset Logic Output. The signal applied to the RESET pin is made available as an output at
RESETO.
16
XTAL1/MCLK
CMOS Logic Clock Input. The XTAL1/MCLK pin interfaces the device’s internal oscillator
circuit to an external crystal or an external clock. A parallel resonant, fundamental-frequency,
microprocessor-grade crystal and a 1 M
resistor should be connected between the MCLK
and XTAL pins with two capacitors connected from each pin to ground. Alternatively, the
XTAL1/MCLK pin can be driven with an external CMOS-compatible clock. The part is
specified with a 12.5 MHz master clock.
17
XTAL2
Oscillator Output. The XTAL2 pin connects the internal oscillator output to an external
crystal. If an external clock is used, XTAL2 should be left unconnected.
19
DVDD
Digital Supply Voltage, +5 V
± 5%.
21, 23
VIN(–), VIN(+) Analog Input. In unipolar operation, the analog input range on VIN(+) is VIN(–) to
(VIN(–) + VREF); for bipolar operation, the analog input range on VIN+ is (VIN(–)
± V
REF/2).
The absolute analog input range must lie between 0 and AVDD. The analog input is con-
tinuously sampled and processed by the analog modulator.
25, 28
AVDD
Analog Positive Supply Voltage, +5 V
± 5%.
22
RESET
Reset Logic Input. RESET is an asynchronous input. When RESET is taken high, the
sigma-delta modulator is reset by shorting the integrator capacitors in the modulator. DVAL
goes low for 20 MCLK cycles while the modulator is being reset.
27
REF1
Reference Input/Output. REF1 connects via a 3 k
resistor to the output of the internal
2.5 V reference, and to the input of a buffer amplifier that drives the sigma-delta modulator.
This pin can also be overdriven with an external 2.5 V reference.
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| AD7720BRUZ | 功能描述:IC MODULATOR SIGMA-DELTA 28TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7720BRUZ-REEL | 功能描述:IC MODULATOR SIGMA-DELTA 28TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7720BRUZ-REEL7 | 功能描述:IC MODULATOR SIGMA-DELTA 28TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
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