ROHM BU2394KN, BU2396 Technical data

TECHNICAL NOTE

High-performance Clock Generator Series

3ch Clock Generators
for Digital Cameras

BU2394KN, BU2396KN

●Description
These PLL, single chip ICs generate three types of clocks - CCD, USB, and VIDEO clocks, utilized in digital still and digital
video camera systems. These IC incorporate compact packaging, a simplification of the clock s ystem, and a reduction in
the number of components used for mobile camera equipment.

●Features

1) Connecting a crystal oscillator generates multiple clock signals with a built-in PLL.

2) The CCD clock provides switching selection outputs.

3) Providing the output of low period-jitter clock.

4) Incorporating compact package VQFN-20 most suited for mobile devices.

5) Single power supply of 3.3 V

●Applications
Digital still camera and digital video camera systems

●Product lineup

Parameter BU2394KN BU2396KN
Supply voltage 3.0V～3.6V 3.0V～3.6V
Operating temperature range -5～＋70℃ -5～＋70℃

14.318182MHz 12.000000MHz Reference input clock

28.636363MHz －

Output CCD clock

Output USB clock 48.008022MHz 12.000000MHz

●Absolute maximum ratings（Ta=25℃）

Parameter Symbol Limit Unit
Supply voltage VDD -0.5～7.0 Ｖ
Input voltage VIN -0.5～VDD+0.5 Ｖ

Storage Temperature range Tstg -30～125 ℃

Power dissipation PD 530 mW

*1 Operation is not guaranteed.
*2 Reduce by 5.3mW/°C over 25°C
*3 This IC is not designed to be radiation-resistant.
*4 Power dissipation is measured when the IC is mounted to the printed circuit board.

135.000000MHz 36.000000MHz

110.000000MHz 30.000000MHz

108.000000MHz 24.000000MHz

98.181818MHz －

14.318182MHz － Output VIDEO clock

17.734450MHz 27.000000MHz

Ver.B Oct.2005

●Recommended operating range

Parameter Symbol Limit Unit
Supply voltage VDD 3.0～3.6 Ｖ
Input H voltage VINH 0.8VDD～VDD Ｖ
Input L voltage VINL 0.0～0.2VDD Ｖ
Operating temperature Topr -5～+70 ℃
Output load CL 15(max.) pF

● Electrical characteristics

BU2394KN(VDD=3.3V, Ta=25℃, unless otherwise specified.)
XTAL_SEL=H with crystal oscillator at a frequency of 28.636363 MHz, while XTAL_SEL=L at 14.318182 MHz

Parameter Symbol

【Action circuit current】
【Output H voltage】

CLK1
CLK2
REF_CLK
【Output L voltage】
CLK1
CLK2
REF_CLK
【Pull-Up resistance value】
FS1, FS2, FS3,

CLK2ON, XTAL_SEL

【Output frequency】
CLK1 FS2:H FS3:H
CLK1 FS2:H FS3:L
CLK1 FS2:L FS3:L
CLK1 FS2:L FS3:H
CLK2
REF_CLK FS1:H
REF_CLK FS1:L
【Output waveform】
Duty1 100MHz or

less
Duty2 100MHz or
more
Rise time

Fall time

【Jitter】
Period-Jitter 1σ
Period-Jitter MIN-MAX P-J

【Output Lock-Time】

Note: The output frequency is determined by the arithmetic (frequency division) expression of a frequency input to XTALIN.

*1 If the input frequency is set to values shown below, the output frequency will be as listed above.

*2 When XTAL_SEL is set to H, the input frequency on XTALIN will be 28.636363 MHz.
*3 When XTAL_SEL is set to L, the input frequency on XTALIN will be 14.318182 MHz.

IDD － 45 60 mA

VOH1 VDD-0.5 VDD-0.2 － V
VOH2 VDD-0.5 VDD-0.2 － V

VOHR VDD-0.5 VDD-0.2 － V

VOL1 － 0.2 0.5 V
VOL2 － 0.2 0.5 V

VOLR － 0.2 0.5 V

Pull-Up

R

Fclk1-1 － 135.000000 － MHz
Fclk1-2 － 108.000000 － MHz
Fclk1-3 － 98.181818 － MHz
Fclk1-4 － 110.000000 － MHz
Fclk2-2 － 48.008022 － MHz
Fref1-1 － 14.318182 － MHz
Fref1-2 － 17.734450 － MHz

Duty1 45 50 55 ％

Duty2 － 50 － ％

Tr － 2.5 － nsec

Tf － 2.5 － nsec

P-J1σ － 30 － psec

MIN-MAX

Tlock － － 1 msec

Min. Typ. Max.

125 250 375 Ω

－ 180 － psec

Limit

2/16

Unit Condition

At no load

When current load = - 9.0mA
When current load = - 7.0mA
When current load = - 4.5mA

When current load =11mA
When current load =9.0mA
When current load =5.5mA

Specified by a current value
running when a voltage of 0V
is applied to a measuring pin.
(R=VDD／I)

XTAL×(1188/63)/2
XTAL×(1056/70)/2
XTAL×(864/63)/2
XTAL×(968/63)/2
XTAL×(228/17)/4
XTAL Output
XTAL×(706/57)/10

Measured at a voltage of 1/2
of VDD
Measured at a voltage of 1/2
of VDD
Period of transition time
required for the output to
reach 80% from 20% of VDD.
Period of transition time
required for the output to
reach 20% from 80% of VDD.

*1
*2

*3

BU2396N(VDD=3.3V, Ta=25℃, Crystal =12.000000MHz, unless otherwise specified.)

Parameter Symbol

Limit

Unit Condition

Min. Typ. Max.

【Action circuit current】

IDD － 23 35 mA

At no load
【Output H voltage】
TGCLK
VCLK
UCLK

VOHT VDD-0.5 － － V
VOHV VDD-0.5 － － V
VOHU VDD-0.5 － － V

When current load =-5.0mA

When current load =-5.0mA

When current load =-5.0mA
【Output L voltage】
TGCLK
VCLK
UCLK

VOLT － － 0.5 V
VOLV － － 0.5 V
VOLU － － 0.5 V

When current load =5.0mA
When current load =5.0mA

When current load =5.0mA
【Pull-Up resistance value】
TGCLK_SEL1

TGCLK_SEL2 Pull-up

R

125 250 375 KΩ

Specified by a current value

running when a voltage of 0V is

applied to a measuring pin.

(R=VDD／I)
【Pull-Down resistance value】

TGCLK_EN、TGCLK_PD
VCLK_EN、VCLK_PD Pull-down

R

25 50 75 KΩ

Specified by a current value

running when a VDD is applied to

a measuring pin.

(R=VDD／I)
【Output frequency】

TGCLK SEL1:L SEL2:L
TGCLK SEL1:L SEL2:H
TGCLK SEL1:H
VCLK
UCLK

TGCLK1 － 24.000000 － MHz
TGCLK2 － 30.000000 － MHz
TGCLK3 － 36.000000 － MHz

VCLK － 27.000000 － MHz
UCLK － 12.000000 － MHz

XTAL×(48/4)/6

XTAL×(60/4)/6

XTAL×(54/3)/6

XTAL×(54/3)/8

XTAL output
【Output waveform】
Duty
Rise time

Duty 45 50 55 ％

Tr － 2.0 － nsec

Measured at a voltage of 1/2 of VDD

Period of transition time required

for the output to reach 80% from

20% of VDD.
Fall time

Tf － 2.0 － nsec

Period of transition time required

for the output to reach 20% from

80% of VDD.
【Jitter】

Period-Jitter 1σ

P-J1σ － 50 － psec

Period-Jitter MIN-MAX P-J

MIN-MAX

【Output Lock-Time】

Tlock － － 1 msec

－ 300 － psec

※1

※2

※3

Note: The output frequency is determined by the arithmetic (frequency division) expression of a frequency input to XTALIN.

If the input frequency is set to 12.000000MHz, the output frequency will be as listed above.

Common to BU2394KN, BU2396KN
※1 Period-Jitter 1σ
This parameter represents standard deviation (=1σ) on cycle distribution data when the output clock c ycles are sampled 1000
times consecutively, with the TDS7104 Digital Phosphor Oscilloscope of Tektronix Japan, Ltd.

※2 Period-Jitter MIN-MAX
This parameter represents a maximum distribution width on cycle distribution data when the output clock cycles are sampled
1000 times consecutively, with the TDS7104 Digital Phosphor Oscilloscope of Tektronix Japan, Ltd.

※3 Output Lock-Time
This parameter represents the elapsed time to reach a voltage of 3.0 V after power supply turns ON and after the system is
switched from power-down to normal operation state, or after the output frequency is switched and is stabilized.

3/16

●Reference data (BU2394KN basic data)

1.0V／div

1.0nsec／div

Fig.1 135MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.2 135MHz Period-Jitter

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10dB／div

Fig.3 135MHz Spectrum

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10KHz／div

1.0V／div

2.0nsec／div

Fig.4 110MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

2.0nsec／div

Fig.7 108MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.5 110MHz Period-Jitter

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.8 108MHz Period-Jitter

At VDD=3.3V and CL=15pF

10dB／div

10KHz／div

Fig.6 110MHz Spectrum

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10dB／div

Fig.9 108MHz Spectrum

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10KHz／div

1.0V／div

2.0nsec／div

Fig.10 98MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.11 98MHz Period-Jitter

At VDD=3.3V and CL=15pF

4/16

10dB／div

10KHz／div

Fig.12 98MHz Spectrum

At VDD=3.3V and CL=15pF

●Reference data (BU2394KN basic data)

1.0V／div

5.0nsec／div

Fig.13 48MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

10.0nsec／div

Fig.16 17.7MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

10.0nsec／div

Fig.19 14.3MHz output wave

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.14 48MHz Period-Jitter

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.17 17.7MHz Period-Jitter

At VDD=3.3V and CL=15pF

1.0V／div

500psec／div

Fig.20 14.3MHz Period-Jitter

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10dB／div

Fig.15 48MHz Spectrum

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10dB／div

Fig.18 17.7MHz Spectrum

At VDD=3.3V and CL=15pF

RBW=1KHz

VBW=100Hz

10dB／div

Fig.21 14.3MHz Spectrum

At VDD=3.3V and CL=15pF

10KHz／div

10KHz／div

10KHz／div

5/16

●Reference data (BU2394KN Temperature and Supply voltage variations data)

55
54
53
52
51
50

Duty[%]

：

49

Duty

48
47
46
45

-25 0 25 50 75 100
Temperature：T[℃]

Fig.22 135MHz

Temperature－Duty

VDD=2.9V
VDD=3.3V

VDD=3.7V

100

90
80

[psec]

70

σ

60

PJ-1

：

50

σ

40
30
20

Period-jitter1

10

0

-25 0 25 50 75 100
Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.23 135MHz

Temperature－Period-Jitter 1σ

55
54
53
52
51
50

Duty[%]

：

49

Duty

48
47
46
45

-25 0 25 50 75 100
Temperature：T[℃]

Fig.25 110MHz

Temperature－Duty

VDD=2.9V
VDD=3.3V

VDD=3.7V

100

90
80

[psec]

70

σ

60

PJ-1

：

50

σ

40
30
20

Period-jitter1

10

0

-25 0 25 50 75 100
Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.26 110MHz

Temperature－Period-Jitter 1σ

55
54
53
52
51
50

Duty[%]

：

49

Duty

48
47
46
45

-25 0 25 50 75 100
Temperature：T[℃]

Fig.28 108MHz

Temperature－Duty

VDD=2.9V
VDD=3.3V

VDD=3.7V

100

90
80

[psec]

70

σ

60

PJ-1

：

50

σ

40
30
20

Period-jitter1

10

0

-25 0 25 50 75 100
Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.29 108MHz

Temperature－Period-Jitter 1σ

55
54
53
52
51
50

Duty[%]

：

49

Duty

48
47
46
45

-25 0 25 50 75 100
Temperature：T[℃]

Fig.31 98MHz

Temperature－Duty

VDD=2.9V
VDD=3.3V

VDD=3.7V

100

90
80

[psec]

70

σ

60

PJ-1

：

50

σ

40
30
20

Period-jitter1

10

0

-25 0 25 50 75 100
Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.32 98MHz

Temperature－Period-Jitter 1σ

6/16

600

500

：

400

300

200

PJ-MIN-MAX[psec]

Period-jitterMIN-MAX

100

0

-25 0 25 50 75 100
Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.24 135MHz

Temperature－Period-Jitter MIN-MAX

600

500

：

400

300

200

PJ-MIN-MAX[psec]

Period-jitterMIN-MAX

100

0

-25 0 25 50 75 100
Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.27 110MHz

Temperature－Period-Jitter MIN-MAX

600

500

：

400

300

200

PJ-MIN-MAX[psec]

Period-jitterMIN-MAX

100

0

-25 0 25 50 75 100

Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.30 108MHz

Temperature－Period-Jitter MIN-MAX

600

500

：

400

300

200

PJ-MIN-MAX[psec]

Period-jitterMIN-MAX

100

0

-25 0 25 50 75 100

Temperature：T[℃]

VDD=2.9V
VDD=3.3V

VDD=3.7V

Fig.33 98MHz

Temperature－Period-Jitter MIN-MAX