ADC0804-N datasheet(4/48 Pages) TI

tên linh kiện	ADC0804-N

Giải thích chi tiết về linh kiện	CMOS 8-bit successive approximation A/D converters that use a differential potentiometric ladder

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4 / 48 page

ADC0801, ADC0802

ADC0803, ADC0804, ADC0805

SNOSBI1B – NOVEMBER 2009 – REVISED FEBRUARY 2013

www.ti.com

AC ELECTRICAL CHARACTERISTICS

The following specifications apply for VCC=5 VDC and TMIN≤ TA≤TMAX (unless otherwise specified)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fCLK = 640 kHz

(1)

103

114

µs

TC

Conversion Time

See (2)(1)

66

73

1/fCLK

Clock Frequency

100

640

1460

kHz

fCLK

VCC = 5V

(2)

Clock Duty Cycle

40%

60%

INTR tied to WR with CS = 0 VDC,

CR

Conversion Rate in Free-Running Mode

8770

9708

conv/s

fCLK = 640 kHz

tW(WR)L

Width of WR Input (Start Pulse Width)

CS = 0 VDC (3)

100

ns

Access Time (Delay from Falling Edge of RD

tACC

CL = 100 pF

135

200

ns

to Output Data Valid)

TRI-STATE Control (Delay from Rising Edge of CL = 10 pF, RL = 10k (See TRI-STATE

t1H, t0H

125

200

ns

RD to Hi-Z State)

TEST CIRCUITS AND WAVEFORMS)

Delay from Falling Edge of WR or RD to Reset

tWI, tRI

300

450

ns

of INTR

CIN

Input Capacitance of Logic Control Inputs

5

7.5

pF

COUT

TRI-STATE Output Capacitance (Data Buffers)

5

7.5

pF

CONTROL INPUTS [Note: CLK IN (Pin 4) is the input of a Schmitt trigger circuit and is therefore specified separately]

VIN (1)

Logical “1” Input Voltage (Except Pin 4 CLK IN) VCC = 5.25 VDC

2

15

VDC

VIN (0)

Logical “0” Input Voltage (Except Pin 4 CLK IN) VCC = 4.75 VDC

0.8

VDC

IIN (1)

Logical “1” Input Current (All Inputs)

VIN = 5 VDC

0.005

1

µADC

IIN (0)

Logical “0” Input Current (All Inputs)

VIN = 0 VDC

–1 –0.005

µADC

CLOCK IN AND CLOCK R

CLK IN (Pin 4) Positive Going Threshold

VT+

2.7

3.1

3.5

VDC

Voltage

CLK IN (Pin 4) Negative Going Threshold

VT−

1.5

1.8

2.1

VDC

Voltage

VH

CLK IN (Pin 4) Hysteresis (VT+)–(VT−)

0.6

1.3

2

VDC

VOUT (0)

Logical “0” CLK R Output Voltage

IO = 360 µA, VCC = 4.75 VDC

0.4

VDC

VOUT (1)

Logical “1” CLK R Output Voltage

IO = −360 µA, VCC = 4.75 VDC

2.4

VDC

DATA OUTPUTS AND INTR

Logical “0” Output Voltage

VOUT (0)

Data Outputs

IOUT = 1.6 mA, VCC = 4.75 VDC

0.4

VDC

INTR Output

IOUT = 1.0 mA, VCC = 4.75 VDC

0.4

VDC

IO = −360 µA, VCC = 4.75 VDC

2.4

VDC

VOUT (1)

Logical “1” Output Voltage

IO = −10 µA, VCC = 4.75 VDC

4.5

VDC

VOUT = 0 VDC

–3

µADC

TRI-STATE Disabled Output Leakage (All Data

IOUT

Buffers)

VOUT = 5 VDC

3

µADC

ISOURCE

VOUT Short to GND, TA = 2 5°C

4.5

6

mADC

ISINK

VOUT Short to VCC, TA = 25°C

9

16

mADC

POWER SUPPLY

Supply Current (Includes Ladder Current)

fCLK = 640 kHz, VREF/2 = NC,

ICC

ADC0801/02/03/04LCJ/05

1.1

1.8

mA

TA = 25°C and CS = 5 V

ADC0804LCN/LCWM

1.9

2.5

mA

(1)

Accuracy is specified at fCLK = 640 kHz. At higher clock frequencies accuracy can degrade. For lower clock frequencies, the duty cycle

limits can be extended so long as the minimum clock high time interval or minimum clock low time interval is no less than 275 ns.

(2)

With an asynchronous start pulse, up to 8 clock periods may be required before the internal clock phases are proper to start the

conversion process. The start request is internally latched, see Figure 48 and FUNCTIONAL DESCRIPTION.

(3)

The CS input is assumed to bracket the WR strobe input and therefore timing is dependent on the WR pulse width. An arbitrarily wide

pulse width will hold the converter in a reset mode and the start of conversion is initiated by the low to high transition of the WR pulse

(see TIMING DIAGRAMS).

4

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Product Folder Links: ADC0801, ADC0802 ADC0803, ADC0804, ADC0805

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