HI3-7152J-5 datasheet(11/16 Pages) INTERSIL

Part #	HI3-7152J-5

Description	10-Bit High Speed A/D Converter with Track and Hold

Download	16 Pages

Scroll/Zoom	100%

Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

Logo

11 / 16 page

6-11

Slow Memory Mode

In slow memory mode, the conversion will be initiated by the

microprocessor by selecting the chip (CS) and pulsing WR

low. This mode is selected by hardwiring the SMODE pin to

V+. This mode is intended for use with microprocessors

(such as the 8086) which can be forced into a WAIT state.

For example, in configuration where the BUSY output is tied

to the 8086 READY input, an attempt to read the data before

the conversion is complete will force the processor into a

WAIT state until BUSY goes high, at which time the data at

the output is valid. This resembles a 5

µs access time RAM.

It allows the processor to initiate a conversion, WAIT, and

READ data with a single READ instruction. When the 8-bit

bus operation is selected, high and low byte data may be

accessed in either order. An I/O truth table is presented in

Table 2 for the slow memory mode of operation.

Fast Memory Mode

The fast memory mode of operation is selected by tying the

SMODE and WR pins to DG. In this mode, the chip performs

continuous conversions and only CS and RD are required to

read the data. Whenever the SMODE pin is low, WR is

independent of CS in starting a conversion cycle. During the

first conversion cycle, HOLD follows WR going low.

Data can be read a byte at a time or all 11 bits at once. The

internal logic disables the output latches from being updated

during a read after the high byte data is accessed. It will

continue to be disabled until after the low byte data is

accessed. THEREFORE, WHEN 8-BIT BUS OPERATION

IS SELECTED, THE DATA MUST BE ACCESSED HIGH

BYTE FIRST, LOW BYTE NEXT. If the low byte is accessed

first followed by high byte, the results from the next conver-

sion cycle will be lost because the updating of the output

latch is disabled. BUSY is continuously low when accessed

with a read command in this mode. An I/O truth table is pre-

sented in Table 3 for the fast memory mode of operation.

The data can be defined in time by monitoring the HOLD pin.

The conversion data can be read after HOLD has gone low.

DMA Mode

This mode is a complete hardware mode where the HI-7152

continuously converts. The user implements hardware to

store the results in memory, bypassing the microprocessor.

This mode is recognized by the chip when SMODE is

hardwired to V+ and CS, RD, WR are hardwired to DG.

When 8-bit bus operation is selected, high and low byte data

may be accessed in either order. BUSY is continuously low

when accessed with a read command in this mode. An I/O

truth table is presented in Table 4 for the DMA mode of

operation.

Optimizing System Performance

The HI-7152 has three ground pins (AG, DG, GND) for

improved system accuracy. Proper grounding and bypassing

is illustrated in Figure 4. The AG pin is a ground pin that

does not carry any current and is used internally as a refer-

ence ground. The reference input and analog input should

be referenced to the analog ground (AG) pin. The digital

inputs and outputs should be referenced to the digital ground

(DG) pin. The GND pin is a return point for the supply current

of the comparator array. The comparator array is designed

such that this current is approximately constant at all times

and does not vary with input voltage. By virtue of the

switched capacitor nature of the comparators, it is necessary

to hold GND firmly at zero volts at all times. Therefore, the

system ground star connection should be located as close to

this pin as possible.

TABLE 2. SLOW MEMORY MODE I/O TRUTH TABLE

(SMODE = V+)

CS

WR

RD

BUS HBE

FUNCTION

0

X

Initiates a Conversion.

1

XXXX

Disables All Chip Commands.

0

X

0

1

X

D0 - D9 and OVR Enabled.

0

X

0

Low Byte Enabled: D0 - D7.

0

X

0

1

High Byte Enabled: D8 - D9,

OVR.

X

1

X

Disables all Outputs

(High Impedance).

NOTE: X = Don’t Care

TABLE 3. FAST MEMORY MODE I/O TRUTH TABLE

(SMODE = DG)

CS

WR

RD

BUS HBE

FUNCTION

X

0

X

Continuous Conversion, WR

may be Tied to DG.

1

XXXX

Disables Only the RD Command.

0

X

0

1

X

D0 - D9 and OVR Enabled.

0

X

0

1

High Byte Enabled: D8 - D9,

OVR (Enable 1st).

0

X

0

Low Byte Enabled: D0 - D7

(Must Enable 2nd).

X

1

X

Disables All Outputs

(High Impedance).

NOTE: X = Don’t Care

TABLE 4. DMA MODE I/O TRUTH TABLE

(SMODE = V+, CS = WR, RD = DG)

BUS

HBE

FUNCTION

1

X

D0 - D9 and OVR Enabled.

0

Low Byte Enabled: D0 - D7.

0

1

High Byte Enabled: D8 - D9, OVR.

NOTE: X = Don’t Care

HI-7152

Similar Part No. - HI3-7152J-5

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	HI3-7151A-9	854Kb / 17P	10-Bit, High Speed, A/D Converter with Track and Hold
	HI3-7151B-9	854Kb / 17P	10-Bit, High Speed, A/D Converter with Track and Hold
	HI3-7151J-5	854Kb / 17P	10-Bit, High Speed, A/D Converter with Track and Hold
	HI3-7151K-5	854Kb / 17P	10-Bit, High Speed, A/D Converter with Track and Hold
	HI3-7153A-9	977Kb / 17P	8-Channel, 10-Bit High Speed Sampling A/D Converter

More results

Similar Description - HI3-7152J-5

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	HI-7151	854Kb / 17P	10-Bit, High Speed, A/D Converter with Track and Hold
Maxim Integrated Produc...	MAX177	132Kb / 4P	CMOS 10-Bit A/D Converter with Track-and-Hold
National Semiconductor ...	ADC1061	320Kb / 11P	10-Bit High-Speed 關P-Compatible A/D Converter with Track/Hold Function
Maxim Integrated Produc...	ADC0820	261Kb / 6P	CMOS High Speed 8-Bit A/D Converter with Track/Hold Function 19-0889; Rev 1; 7/96
NXP Semiconductors	ADC0820	107Kb / 14P	8-Bit, high-speed, mP-compatible A/D converter with track/hold function August 31, 1994
Maxim Integrated Produc...	MAX150	439Kb / 12P	CMOS High Speed 8Bit A/D Converter with Refrence and Track/Hold Function Rev 1; 8/93
Intersil Corporation	CA3310	355Kb / 16P	CMOS, 10-Bit, A/D Converters with Internal Track and Hold
	CA3310	120Kb / 15P	CMOS, 10-Bit, A/D Converters with Internal Track and Hold August 1997
	HI5810	423Kb / 12P	CMOS 10 Microsecond, 12-Bit, Sampling A/D Converter with Internal Track and Hold
Texas Instruments	ADC0820-N	1Mb / 29P	[Old version datasheet] 8-Bit High Speed 關P Compatible A/D Converter with Track/Hold Function

More results

HI3-7152J-5 Datasheet(PDF) 11 Page - Intersil Corporation

HI3-7152J-5 Datasheet(HTML) 11 Page - Intersil Corporation

Similar Part No. - HI3-7152J-5

Similar Description - HI3-7152J-5

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Datasheet Download

Link URL