MC144111PS

更新时间： 2024-01-13 05:51:23

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		转换器
页数	文件大小	规格书
8页	188K
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数据手册

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MC144111PS 数据手册

PIN DESCRIPTIONS

OUTPUTS

INPUTS

out

Data Output

Data Input

The digital data output is primarily used for cascading the

DACs and may be fed into D of the next stage.

Six–bit words are entered serially, MSB first, into digital

R1 Out through Rn Out

Resistor Network Outputs

data input, D . Six words are loaded into the MC144110

during each D/A cycle; four words are loaded into the

MC144111.

The last 6–bit word shifted in determines the output level of

pins Q1 Out and R1 Out. The next–to–last 6–bit word affects

pins Q2 Out and R2 Out, etc.

These are the R–2R resistor network outputs. These out-

puts may be fed to high–impedance input FET op amps to

bypass the on–chip bipolar transistors. The R value of the re-

sistor network ranges from 7 to 15 kΩ.

Q1 Out through Qn Out

NPN Transistor Outputs

ENB

Negative Logic Enable

Buffered DAC outputs utilize an emitter–follower configu-

ration for current–gain, thereby allowing interface to low–im-

pedance circuits.

The ENB pin must be low (active) during the serial load.

On the low–to–high transition of ENB, data contained in the

shift register is loaded into the latch.

SUPPLY PINS

CLK

Shift Register Clock

Negative Supply Voltage

Data is shifted into the register on the high–to–low transi-

tion of CLK. CLK is fed into the D–input of a transparent

latch, which is used for inhibiting the clocking of the shift reg-

ister when ENB is high.

The number of clock cycles required for the MC144110 is

usually 36. The MC144111 usually uses 24 cycles. See

Table 1 for additional information.

This pin is usually ground.

Positive Supply Voltage

The voltage applied to this pin is used to scale the analog

output swing from 4.5 to 15 V p–p.

Table 1. Number of Channels vs Clocks Required

Number of

Channels

Required

Number of

Clock Cycles

Outputs Used on MC144110

Outputs Used on MC144111

Q1/R1

Q1/R1, Q2/R2

Q1/R1, Q2/R2, Q3/R3

Q1/R1, Q2/R2, Q3/R3, Q4/R4

Not Applicable

Q1/R1, Q2/R2, Q3/R3, Q4/R4

Q1/R1, Q2/R2, Q3/R3, Q4/R4, Q5/R5

Q1/R1, Q2/R2, Q3/R3, Q4/R4, Q5/R5, Q6/R6

Not Applicable

MC144110•MC144111

MOTOROLA

1...3 4 567 8

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