DS1086LU-222+ Maxim Integrated, DS1086LU-222+ Datasheet - Page 10

• Manufacturer Part Number: DS1086LU-222+
• Description: Programmable Oscillators SS OSC 22.1184Mhz
• Manufacturer: Maxim Integrated
• Series: DS1086r

Specifications of DS1086LU-222+

• Rohs: yes
• Package / Case: uSOP-8
• Frequency: 130 KHz to 66.6 MHz
• Supply Voltage: 2.7 V to 3.6 V
• Load Capacitance: 15 pF
• Minimum Operating Temperature: - 40 C
• Maximum Operating Temperature: + 85 C
• Product: Programmable
• Part # Aliases: 90-1L86U+222

The output frequency is determined by the following
equation:
where: min frequency of selected OFFSET range is the
lowest frequency (shown in Table 2 for the correspond-
ing offset).
3.3V Spread-Spectrum EconOscillator
DS1086L
Table 1. Register Summary
X
X
X
X = Don’t care.
Table 2. Offset Settings
* Factory default setting. OS is the integer value of the five LSBs
of the RANGE register.
10
f
OUTPUT
PRESCALER
PRESCALER
DAC (MSB)
DAC (LSB)
OFFSET
ADDR
RANGE
WRITE EE
0
1
X
REGISTER
= Don’t care, reads as zero.
= Don’t care, reads as one.
= Don’t care, reads indeterminate.
OFFSET
OS + 1
OS + 2
OS + 3
OS + 4
OS + 5
OS + 6
OS - 6
OS - 5
OS - 4
OS - 3
OS - 2
OS - 1
OS*
=
(
MIN FREQUENCY OF SELECTED OFFSET
ADDR
0Dh
02h
08h
0Eh
37h
3Fh
—
—
+
(
DAC VALUE
FREQUENCY RANGE (MHz)
MSB
JS4
P1
b9
b1
X
X
X
1
1
X
PRESC
30.74 to 35.86
33.30 to 38.42
35.86 to 40.98
38.42 to 43.54
40.98 to 46.10
43.54 to 48.66
46.10 to 51.22
48.66 to 53.78
51.22 to 56.34
53.78 to 58.90
56.34 to 61.46
58.90 to 64.02
61.46 to 66.58
× 5
JS3
P0
b8
b0
X
X
X
A A LER
kHz STEP SIZE
1
1
X
JS2
b7
X
X
X
X
X
X
0
1
1
X
)
JS1
X
b6
X
b4
X
b4
RANGE
NO DATA
X
0
1
BINARY
)
JS0
WC
b5
b3
b3
X
X
X
0
DAC value is the value of the DAC register (0 to 1023).
Prescaler is the value of 2
See the Example Frequency Calculations section for a
more in-depth look at using the registers.
The DS1086L registers are used to program the output
frequency, dither percent, dither rate, and 2-wire
address. Table 1 shows a summary of the registers and
detailed descriptions follow below.
The PRESCALER word is a two-byte value containing
control bits for the prescaler (P3 to P0), output control
(Lo/HiZ), the jitter rate (JS4 to JS3), as well as control
bits for the jitter percentage (JS2 to JS0). The
PRESCALER word is read and written using two-byte
reads and writes beginning at address 02h.
JS4 to JS3: Jitter Rate. This is the frequency of the tri-
angle wave generator and the modulation frequency
that the output is dithered. It can be programmed to the
master oscillator frequency, f
8192, 4096, or 2048.
LO/HiZ
________________Register Definitions
b4
b2
X
X
A2
b2
JS4
X
0
0
0
1
JS3
P3
b3
b1
A1
b1
X
X
0
1
0
X
0
LSB
P2
X
b2
b0
A0
b0
X
X
0
f
OSC
JITTER RATE
f
f
/4096 (default)
OSC
OSC
0 1 1 0 0 0 0 0
01111101b
00000000b
1 1 1 - - - - - b
11110000b
FACTORY
0 0 X X X X X
x x x - - - - - b
DEFAULT
x
where x = 0 to 8.
/8192
/2048
—
OSC
PRESCALER (02h)
, divided by either
Maxim Integrated
ACCESS
R/W
R/W
R/W
R/W
R/W
R/W
—
R