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ADA4254ACPZ-R7 数据表(PDF) 26 Page - Analog Devices |
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ADA4254ACPZ-R7 数据表(HTML) 26 Page - Analog Devices |
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26 / 59 page  ADA4254 Data Sheet Rev. B | Page 26 of 59 POWER SUPPLIES The ADA4254 has three supply voltage domains: the high voltage analog input amplifier supply, the low voltage analog output amplifier supply, and the low voltage digital supply. The high voltage analog supplies, VDDH and VSSH, power the input section of the ADA4254. VSSH is connected to the substrate of the ADA4254. Therefore, VSSH must be connected to the most negative supply voltage in the circuit and VSSH must not exceed AVSS. It is recommended to use a Schottky diode to clamp VSSH to AVSS. The Schottky diode must have a forward bias voltage of 0.3 V or lower at 1 mA and withstand −28 V of reverse voltage. The ADA4254 monitors the VDDH and VSSH supplies to detect if the VDDH or VSSH drops below 8 V and sets the POR_HV flag. VDDH and VSSH must be decoupled with 0.1 μF and 1 μF to ground, as close to the pins as possible. The low voltage analog output amplifier supply, AVDD and AVSS, powers the output amplifier of the ADA4254. AVSS must be within VSSH − 0.3 V to VSSH + 30 V and VDDH – 30 V to VDDH + 0.3 V. AVDD − AVSS is typically a 5 V single supply, compatible with most high precision ADCs. Use 0.1 μF and 10 μF decoupling capacitors between AVDD and AVSS as close as possible to the AVDD and AVSS supply pins. The digital supplies, DVDD and DVSS, power the digital circuitry inside the ADA4254. DVSS must be the same potential as AVSS. Use 0.1 μF and 1 μF decoupling capacitors from DVDD to DVSS as close as possible to the DVDD and DVSS supply pins. Figure 84 shows a typical ADA4254 supply configuration. The recommended decoupling values described in this section are minimum recommendations. Depending on amplifier loading and system noise, higher capacitance values and/or additional lower capacitor values may improve performance. VDDH = +28V VDDH DVDD DVSS AVDD AVSS VOCM ADA4254 VSSH VSSH = –28V RB751S40T1G 1µF 0.1µF 1µF 0.1µF DVDD = 3.3V 10µF 0.1µF VOCM = 2.5V 1µF 1kΩ AVDD = 5V 1µF 0.1µF Figure 84. Typical ADA4254 Power Supply Configuration ESD MAP Figure 85 shows the various ESD diode paths inside the ADA4254. Figure 85, in conjunction with the Absolute Maximum Ratings section, helps in understanding current paths during power-on and fault conditions. VSSH VDDH AVDD AVSS DVSS DVDD SPI INTERFACE DIGITAL CONTROL 7 × GPIO IOUT_HV VDDH EXCITATION CURRENTS DVDD DVSS VDDH VSSH 300Ω ±60V CLAMP VSSH ±60V CLAMP VSSH ±60V CLAMP VSSH ±60V CLAMP 300Ω VDDH 300Ω 300Ω VDDH AVDD AVSS AVDD VSSH VDDH DVSS DVDD AVSS AVDD AVSS AVDD AVSS AVDD DVSS DVDD ROUT AVDD VDDH RIN VSSH VSSH AVSS ROUT IOUT_LV +IN1 –IN1 +IN2 –IN2 –OUT VOCM –OUT Figure 85. ESD Map |
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