Datasheet > IL9270D

IL9270D

更新时间： 2022-01-13 09:45:52

品牌	Logo	应用领域
INTEGRAL		栅
页数	文件大小	规格书
12页	716K
描述
DTMF RECEIVER High-Performance Silicon-Gate CMOS

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IL9270D 数据手册

IL9270

PIN DESCRIPTIONS

NAME

DESCRIPTION

ESt

Early steering output. Presents a logic high immediately when the digital

algorithm detects a recognizable tone-pair (signal condition). Any momentary

loss of signal condition will cause ESt to return to a logic low.

Gain Select. Gives access to output of front-end differential amplifier for

connection of feedback resistor.

IN+

IN-

5,6

Internal Connection. Must be tied to GND.

Non-Inverting Input

Inverting Input

Clock Input

Connections to the front-end

differential amplifier.

3.579545 MHz crystal connected between

these pins completes internal oscillator.

Clock Output

Q1-Q4

11-14

3-state data outputs. When enabled by OE, provide the code corresponding to the

last valid tone-pair received.

StD

Delayed steering output. Presents a logic high when a received tone-pair has been

registered and the output latch updated; returns to logic low when the voltage on

St/GT falls below V_TSt

St/GT

Steering input/guard time output (bi-directional). A voltage greater than V_TSt

detected at St causes the device to register the detected tone-pair and update the

output latch. A voltage less than V_TStfrees the device to accept a new tone-pair.

The GT output acts to reset the external steering time-constant; its state is a

function of ESt and the voltage on St.

3-state output enable (input). Logic high enables the outputs Q1-Q4. Internal

pull-up.

V_CC

Positive power supply, +5 V.

V_REF

Reference voltage output, nominally V_CC/2. May be used to bias the inputs at

mid-rail.

GND

Negative power supply, normally connected to 0 V.

FUNCTIONAL DESCRIPTION

The IL9270 monolithic DTMF receivers offer small size,

low power consumption and high performance. The

architecture consists of a bandsplit filter section, which

separates the high and low tones of a receiver pair,

followed by a digital counting section which verifies the

frequency and duration of the received tones before

passing the corresponding code to the output bus.

order for the low group. The band-widths of which

correspond to the bands enclosing the low-group and

high-group tones (see Figure 1). The filter section also

incorporates notches at 350 Hz and 440 Hz for

exceptional dial-tone rejection. Each filter output is

followed by a second order switched-capacitor section

which smooths the signals prior to limiting. Limiting is

performed by high-gain comparators which are provided

with hysteresis to prevent detection of unwanted low-

level signals and noise; the outputs of the comparators

provide full-rail logic swings at the frequencies of the

incoming tones.

Filter Section

Separation of the low-group and high-group tones is

achieved byapplying the dual-tone signal to the inputs of

two filters - a sixth order for the high group and an eight

123 4 5 6 7...12

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与IL9270D相关器件

型号	品牌	获取价格	描述	数据表
IL9270N	INTEGRAL	获取价格	DTMF RECEIVER High-Performance Silicon-Gate CMOS
IL9910D	INTEGRAL	获取价格	Interface Circuit
IL9910DH	INTEGRAL	获取价格	Interface Circuit
IL9910N	INTEGRAL	获取价格	Interface Circuit
IL-9P-S3EN2	JAE	获取价格	Board Connector, 9 Contact(s), 1 Row(s), Male, Straight, Solder Terminal,
IL-9P-S3EN2-3	JAE	获取价格	Board Connector, 9 Contact(s), 1 Row(s), Male, Straight, Solder Terminal,
IL-9P-S3EN2-B1	JAE	获取价格	Board Connector, 9 Contact(s), 1 Row(s), Male, Straight, Solder Terminal,
IL-9P-S3FP2	JAE	获取价格	Board Connector, 8 Contact(s), 1 Row(s), Male, Right Angle, Solder Terminal,
IL-9P-S3FP2-1	JAE	获取价格	Board Connector, 9 Contact(s), 1 Row(s), Male, Right Angle, Solder Terminal,
IL-9P-S3UX2	JAE	获取价格	Board Connector, 9 Contact(s), 1 Row(s), Male, Straight, Solder Terminal

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