---
page_id: wsd-this-also-means-the-dacs-can-switch-way-35e75f34
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title: "Thread: This also means the DACs can switch way"
slug: wsd-this-also-means-the-dacs-can-switch-way-35e75f34
route: /evidence/i-information/general/threads/this-also-means-the-dacs-can-switch-way
section: reference
access: public
summary: 8 Discord messages from ℹ️ - Information/general/threads/this-also-means-the-dacs-can-switch-way.md.
status: published
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/i-information/general/threads/this-also-means-the-dacs-can-switch-way.talk.md
talk_route: /evidence/i-information/general/threads/this-also-means-the-dacs-can-switch-way/talk
---
# Thread: This also means the DACs can switch way
Category: **ℹ️ - Information**
Parent channel: **#general**
Thread ID: `1504155294610096129`
Messages: **8**
## message-1504155436696211517
**2026-05-13T16:16:41.965+00:00 — namibj**
- Message ID: `1504155436696211517`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `21`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504155436696211517
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1361349523724570941/1504155294610096129
Reference data
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**Content**
```text
```
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---
## message-1504155439665909760
**2026-05-13T16:16:42.673+00:00 — namibj**
- Message ID: `1504155439665909760`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504155439665909760
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
what topology of DAC are you uisng?
```
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## message-1504156605837479986
**2026-05-13T16:21:20.71+00:00 — Tholin (@tholin)**
- Message ID: `1504156605837479986`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504156605837479986
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
R2R
```
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---
## message-1504156659222843583
**2026-05-13T16:21:33.438+00:00 — Tholin (@tholin)**
- Message ID: `1504156659222843583`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504156659222843583
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
With an op-amp buffer
```
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---
## message-1504161170561695985
**2026-05-13T16:39:29.025+00:00 — namibj**
- Message ID: `1504161170561695985`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504161170561695985
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
R2R has natural fairly constant impedance already, likely less than 1kOhm btw.
```
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---
## message-1504167701827031221
**2026-05-13T17:05:26.2+00:00 — Tholin (@tholin)**
- Message ID: `1504167701827031221`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504167701827031221
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
Depends on what’s driving the resistors
```
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---
## message-1504167739449933945
**2026-05-13T17:05:35.17+00:00 — Tholin (@tholin)**
- Message ID: `1504167739449933945`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504167739449933945
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
The buf_12 cells can barely keep up, at least in the sim,
```
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---
## message-1504185011362992261
**2026-05-13T18:14:13.115+00:00 — namibj**
- Message ID: `1504185011362992261`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1504155294610096129/1504185011362992261
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05.json
**Content**
```text
17 digits; R-4R network; should be about exactly 12 ENOB. Serial digit input; latched parallel output; It's sky130 design though.
I'm looking forward to tuning it though for future usage to be a bit more compact; that design uses unnecessary gaps between width of poly along the string (fair for aiming at binary R-2R by praying for sufficiently good matching to not catch DNL; not necessary if the PDK is to be believed for a sub-radix version) and the DFFs are strength 2 not 1 and have space for a tap lengthwise between each one.
Cutting those out of there and a sliver of rounding-up size to make them line up with the resistor network, saves (up to) 0.94; the pitch savings in the resistor array from combining the 4 parallel 0p35 resistors of each string-wise leg into one 1p41 are if I mathed correctly 0.85, so one tap every `5 1/9` DFFs.
Or I fit it in with a normal digital cell layout and slightly extend the thin ones but cut the thick ones to "just" 0p65 (and possibly even slightly shorten) for up to 1.57 saving (not in addition to the 0.85 possible by just alternating 0p35 with 1p41 fixed-width devices) ....
Oh wait it's two compacted strings per cell pitch because double-sided, so actually the resistor shrink would no longer fit these vertical cells anyways; it would fit with the stronger shrink 2 cells vertically though (5.44 for those two cells height; 5.16 with the 0p69 resistor and assumed shortening; 6.6 with the equal-length-kept 1p41 resistor; it's the narrow resistors though driven from the logic outputs that dictate minimum length (for current density reasons) so a slightly shorter 0.69 to be more R-3R than R-2R should suffice and probably even yields extra resolution per digit at the same time.
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/this-also-means-the-dacs-can-switch-way/2026-05/2026-05_media/image-D5381.png
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