ADS8694IDBTR datasheet(22/77 Pages) TI1

Teilenummer	ADS8694IDBTR

Bauteilbeschribung	4- and 8-Channel, Single-Supply, SAR ADCs

Download	77 Pages

Scroll/Zoom	100%

Hersteller	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

Logo

22 / 77 page

VOUT

V+

V±

+

VB

AVDD

GND

AIN_nP

AIN_nGND

1

0

1

0

RDC

RFB

0V

VP+

VP-

RS

ESD

D1p

D2n

RS

AVDD

D2p

D1n

ESD

ADS8694, ADS8698

SBAS686 – JULY 2015

www.ti.com

Feature Description (continued)

8.3.3 Input Overvoltage Protection Circuit

The ADS8694 and ADS8698 feature an internal overvoltage protection circuit on each of the four or eight analog

input channels, respectively. Use these protection circuits as a secondary protection scheme to protect the

device. Using external protection devices against surges, electrostatic discharge (ESD), and electrical fast

transient (EFT) conditions is highly recommended. The conceptual block diagram of the internal overvoltage

protection (OVP) circuit is shown in Figure 52.

Figure 52. Input Overvoltage Protection Circuit Schematic

As shown in Figure 52, the combination of the 1-M

Ω input resistors along with the PGA gain-setting resistors

(RFB and RDC) limit the current flowing into the input pins. A combination of antiparallel diodes (D1 and D2) are

added on each input pin to protect the internal circuitry and set the overvoltage protection limits.

Table 1 explains the various operating conditions for the device when the device is powered on. Table 1

indicates that when the AVDD pin of the device is connected to the proper supply voltage (AVDD = 5 V) or offers

a low impedance of < 30 k

Ω, the internal overvoltage protection circuit can withstand up to ±20 V on the analog

input pins.

Table 1. Input Overvoltage Protection Limits When AVDD = 5 V or Offers a Low Impedance of < 30 k

Ω(1)

INPUT CONDITION

TEST

ADC

COMMENTS

(VOVP = ±20 V)

CONDITION

OUTPUT

All input

|VIN| < |VRANGE|

Within operating range

Valid

Device functions as per data sheet specifications

ranges

Beyond operating range but

All input

ADC output is saturated, but device is internally

|VRANGE| < |VIN| < |VOVP|

Saturated

within overvoltage range

ranges

protected (not recommended for extended time)

All input

This usage condition may cause irreversible damage

|VIN| > |VOVP|

Beyond overvoltage range

Saturated

ranges

to the device

(1)

GND = 0, AIN_nGND = 0 V, |VRANGE| is the maximum input voltage for any selected input range, and |VOVP| is the break-down voltage

for the internal OVP circuit. Assume that RS is approximately 0.

The results indicated in Table 1 are based on an assumption that the analog input pins are driven by very low

impedance sources (RS is approximately 0). However, if the sources driving the inputs have higher impedance,

the current flowing through the protection diodes reduces further, thereby increasing the OVP voltage range.

Note that higher source impedance results in gain errors and contributes to overall system noise performance.

22

Submit Documentation Feedback

Product Folder Links: ADS8694 ADS8698

Ähnliche Beschreibung - ADS8694IDBTR

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
Texas Instruments	ADS8664	2Mb / 79P	[Old version datasheet] 4- and 8-Channel, Single-Supply, SAR ADCs
	ADS8674	3Mb / 79P	[Old version datasheet] 4- and 8-Channel, Single-Supply, SAR ADCs
	ADS8684A	3Mb / 80P	[Old version datasheet] 4- and 8-Channel, Single-Supply, SAR ADCs
SG Micro Corp	SGM51652H4	1Mb / 43P	16-Bit, 500kSPS, 4- and 8-Channel,Single Supply, SAR ADCs with Bipolar Input Ranges DECEMBER 2022-REV.A
Intersil Corporation	ISL26712	891Kb / 21P	12-Bit, 10-Bit and 8-Bit, 1MSPS SAR ADCs
Renesas Technology Corp	ISL26712	1Mb / 21P	12-Bit, 10-Bit and 8-Bit, 1MSPS SAR ADCs
Intersil Corporation	ISL26712IRTZ	888Kb / 21P	12-Bit, 10-Bit and 8-Bit, 1MSPS SAR ADCs September 5, 2012
Maxim Integrated Produc...	MAX1108	185Kb / 20P	Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs 19-1399; Rev 0; 10/98
	MAX1108	326Kb / 20P	Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs Rev 1; 6/03
	MAX1117	406Kb / 14P	Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs

More results

ADS8694IDBTR Datenblatt(PDF) 22 Page - Texas Instruments

ADS8694IDBTR Datenblatt(HTML) 22 Page - Texas Instruments

Ähnliche Teilenummer - ADS8694IDBTR

Ähnliche Beschreibung - ADS8694IDBTR

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77

Datenblatt Download

Link URL