DS1094LU-42M+ Maxim Integrated Products, DS1094LU-42M+ Datasheet - Page 6

• Manufacturer Part Number: DS1094LU-42M+
• Description: IC ECONOSCILLATOR SS 8-USOP
• Manufacturer: Maxim Integrated Products
• Series: EconOscillator™r
• Type: Clock Generatorr

Specifications of DS1094LU-42M+

• Pll: No
• Input: Clock
• Output: Clock
• Number Of Circuits: 1
• Ratio - Input:output: 2:4
• Differential - Input:output: No/No
• Frequency - Max: 2MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Frequency-max: 2MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The DS1094L consists of a master oscillator, prescaler,
phase generator, and triangle-wave generator (used to
dither the master oscillator), which are all programma-
ble using the 2-wire interface and stored in NV memory.
The master oscillator is responsible for generating the
timing (frequency) of the outputs. The master oscillator
frequency, f
between 1MHz to 2MHz in 100kHz steps. The master
oscillator is programmed using the DAC register. The four
MSBs of the DAC register are don’t cares, while the four
Multiphase Spread-Spectrum EconOscillator
Table 1. Master Oscillator Settings
6
DAC VALUE (dec)
GND
SDA
SCL
V
_____________________________________________________________________
CC
11 to 15
10
—
0
1
2
V
CC
MOSC
INTERFACE
EEPROM
2-WIRE
SERIAL
WRITE EE
COMMAND
, can be programmed anywhere
DAC REGISTER
Detailed Description
0Bh to 0Fh
EEPROM WRITE CONTROL
2-WIRE ADDRESS BITS
0Ah
00h
01h
02h
—
ADDR
DAC
PRESCALER
D1
X
X
D0
X
X
CONTROL REGISTERS
Master Oscillator
PH1
X
X
PH0
X
X
WC
D3
J1
A2
D2
J0
Reserved
1.0MHz
1.1MHz
1.2MHz
2.0MHz
DITHER RATE
DAC SETTING
f
MOSC
A1
D1
P1
DITHER %
—
A0
D0
P0
GENERATOR
TRIANGLE
1MHz TO 2MHz
OSCILLATOR
WAVE
MASTER
LSBs (D3 to D0) are the DAC value. The master oscillator
frequency is determined using the following equation:
Valid values for DAC are 0 to 10 (dec). DAC values
greater than 10 exceed the 2MHz limit and are not per-
mitted.
The master oscillator also determines the spread-spec-
trum dither frequency. This is described in the Triangle
Wave Generator section.
f
Table 2. Prescaler Settings
MOD
BITS P1, P0
PRESCALER SETTING
f
f
MOSC
MOSC
00
01
10
11
f
MOSC
= 1MHz + (DAC value x 100kHz)
PRESCALER
1, 2, 4, OR 8
DIVIDE BY
Functional Diagram
DIVISOR
DS1094L
PHASE SELECT
f
2
2
2
2
OSC
0
1
2
3
FOUR-PHASE
TWO/THREE/
GENERATOR
f
OUT
f
f
f
f
MOSC
MOSC
MOSC
MOSC
f
OSC
OUT1
OUT2
OUT3
OUT4
=
/1
/2
/4
/8